feat(docs): create sukr documentation site with fixes

Self-documenting docs site built with sukr itself (dogfooding):

Core changes:
- Rename package from nrd-sh to sukr
- Move personal site to sites/nrd.sh/
- Update AGENTS.md and README.md

Documentation site (docs/):
- Add site.toml with sukr.io base URL
- Create docs-specific templates with sidebar navigation
- Add dark theme CSS with syntax highlighting colors
- Document all features: templates, sections, syntax highlighting,
  mermaid diagrams, and LaTeX math rendering

Bug fixes:
- Render individual pages for all sections (not just blog type)
- Add #[source] error chaining for Tera template errors
- Print full error chain in main() for better debugging

docs/content/features/math.md

@@ -0,0 +1,81 @@
+---
+title: Math Rendering
+description: Build-time LaTeX math with KaTeX
+weight: 5
+---
+
+# Math Rendering
+
+sukr renders LaTeX math expressions at build time using KaTeX, producing static HTML and CSS. No client-side JavaScript required.
+
+## Inline Math
+
+Use single dollar signs for inline math:
+
+```markdown
+The quadratic formula is $x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}$.
+```
+
+Renders as: The quadratic formula is $x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}$.
+
+## Display Math
+
+Use double dollar signs for display (block) math:
+
+```markdown
+$$
+E = mc^2
+$$
+```
+
+Or fence with `math` language:
+
+````markdown
+```math
+\int_0^\infty e^{-x^2} dx = \frac{\sqrt{\pi}}{2}
+```
+````
+
+## Supported Features
+
+KaTeX supports a large subset of LaTeX math:
+
+- Greek letters: `$\alpha, \beta, \gamma$`
+- Fractions: `$\frac{a}{b}$`
+- Subscripts/superscripts: `$x_i^2$`
+- Summations: `$\sum_{i=1}^{n} i$`
+- Integrals: `$\int_a^b f(x)\,dx$`
+- Matrices: `$\begin{pmatrix} a & b \\ c & d \end{pmatrix}$`
+- And much more...
+
+## How It Works
+
+1. Math delimiters (`$...$`, `$$...$$`) are detected during parsing
+2. KaTeX renders the expression to HTML + CSS
+3. Required fonts are embedded inline
+4. Output is pure HTML—no JavaScript
+
+## Styling
+
+KaTeX output uses semantic classes. Customize appearance:
+
+```css
+.katex {
+  font-size: 1.1em;
+}
+
+.katex-display {
+  margin: 1.5em 0;
+  overflow-x: auto;
+}
+```
+
+## Error Handling
+
+Invalid LaTeX produces an error message inline rather than breaking the build:
+
+```markdown
+$\invalid{command}$
+```
+
+Renders with a red error indicator showing what went wrong.

docs/content/features/mermaid.md

@@ -0,0 +1,70 @@
+---
+title: Mermaid Diagrams
+description: Build-time diagram rendering with Mermaid
+weight: 4
+---
+
+# Mermaid Diagrams
+
+sukr renders Mermaid diagrams at build time, producing inline SVG. No client-side JavaScript required.
+
+## Usage
+
+Use fenced code blocks with `mermaid` language:
+
+````markdown
+```mermaid
+graph LR
+    A[Input] --> B[Process]
+    B --> C[Output]
+```
+````
+
+## Supported Diagram Types
+
+| Type      | Status          | Description                               |
+| --------- | --------------- | ----------------------------------------- |
+| Flowchart | ✅ Full support | Flow diagrams with nodes and edges        |
+| Graph     | ✅ Full support | Directed/undirected graphs                |
+| Sequence  | ⚠️ Partial      | Sequence diagrams (some layouts may vary) |
+| State     | ⚠️ Partial      | State machine diagrams                    |
+| Class     | ⚠️ Partial      | UML class diagrams                        |
+
+> **Note:** Some complex diagram types may have layout differences compared to the JavaScript renderer. Flowcharts and basic graphs work reliably.
+
+## How It Works
+
+1. During Markdown parsing, `mermaid` code blocks are intercepted
+2. The Mermaid definition is parsed and rendered to SVG
+3. The SVG is inlined directly in the HTML output
+4. No JavaScript or external resources needed
+
+## Example
+
+```mermaid
+graph TD
+    A[Markdown] --> B{sukr}
+    B --> C[HTML]
+    B --> D[SVG Diagrams]
+    B --> E[Highlighted Code]
+```
+
+## Styling
+
+Mermaid SVGs inherit your CSS variables. Customize the look by targeting SVG elements:
+
+```css
+.mermaid svg {
+  max-width: 100%;
+  height: auto;
+}
+
+.mermaid .node rect {
+  fill: var(--bg-sidebar);
+  stroke: var(--accent);
+}
+```
+
+## Fallback
+
+If a diagram fails to render (complex diagrams, syntax errors), the original code block is preserved with an error comment.

docs/content/features/sections.md

@@ -12,7 +12,7 @@ sukr automatically discovers sections from your content directory structure.
 
 A section is any directory under `content/` that contains an `_index.md` file:
 
-```
+```text
 content/
 ├── _index.md           # Homepage (not a section)
 ├── about.md            # Standalone page

docs/content/features/templates.md

@@ -10,7 +10,7 @@ sukr uses [Tera](https://tera.netlify.app/), a Jinja2-like templating engine. Te
 
 ## Template Directory Structure
 
-```
+```text
 templates/
 ├── base.html               # Shared layout (required)
 ├── page.html               # Standalone pages

docs/static/style.css

@@ -150,6 +150,64 @@ pre code {
   padding: 0;
 }
 
+/* Syntax highlighting (tree-sitter classes) */
+.hl-keyword {
+  color: #ff79c6;
+}
+
+.hl-string {
+  color: #f1fa8c;
+}
+
+.hl-function {
+  color: #50fa7b;
+}
+
+.hl-comment {
+  color: #6272a4;
+  font-style: italic;
+}
+
+.hl-number {
+  color: #bd93f9;
+}
+
+.hl-operator {
+  color: #ff79c6;
+}
+
+.hl-punctuation {
+  color: var(--fg-muted);
+}
+
+.hl-punctuation-bracket {
+  color: var(--fg-muted);
+}
+
+.hl-variable {
+  color: var(--fg);
+}
+
+.hl-type {
+  color: #8be9fd;
+}
+
+.hl-constant {
+  color: #bd93f9;
+}
+
+.hl-attribute {
+  color: #50fa7b;
+}
+
+.hl-property {
+  color: #66d9ef;
+}
+
+.hl-tag {
+  color: #ff79c6;
+}
+
 /* Section navigation */
 .section-nav {
   display: flex;
@@ -184,7 +242,8 @@ pre code {
 }
 
 /* Lists */
-ul, ol {
+ul,
+ol {
   margin: 1rem 0;
   padding-left: 1.5rem;
 }
@@ -200,7 +259,8 @@ table {
   margin: 1rem 0;
 }
 
-th, td {
+th,
+td {
   padding: 0.75rem;
   text-align: left;
   border: 1px solid var(--border);

docs/templates/base.html

@@ -1,37 +1,26 @@
 <!doctype html>
 <html lang="en">
-  <head>
+
+<head>
   <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1" />
   <title>{{ title }} | {{ config.title }}</title>
   <link rel="canonical" href="{{ base_url }}{{ page_path }}" />
   <link rel="stylesheet" href="{{ prefix }}/style.css" />
-  </head>
+</head>
 
-  <body>
+<body>
   <aside class="sidebar">
     <header>
       <a href="{{ prefix }}/index.html" class="logo">sukr</a>
       <span class="tagline">suckless static sites</span>
     </header>
     <nav>
-        {% for item in nav %}
-        <a
-          href="{{ prefix }}{{ item.path }}"
-          {%
-          if
-          page_path=""
-          ="item.path"
-          %}
-          class="active"
-          {%
-          endif
-          %}
-          >{{ item.label }}</a
-        >
-        {% endfor %}
+      {% for item in nav %}<a href="{{ prefix }}{{ item.path }}" {% if page_path==item.path %} class="active" {% endif
+        %}>{{ item.label }}</a>{% endfor %}
     </nav>
   </aside>
   <main>{% block content %}{% endblock content %}</main>
-  </body>
+</body>
+
 </html>

src/main.rs

@@ -142,8 +142,7 @@ fn run(config_path: &Path) -> Result<()> {
             }
         }
 
-        // Render individual content pages (for blog posts)
-        if section.section_type == "blog" {
+        // Render individual content pages for all sections
         for item in &items {
             eprintln!("  processing: {}", item.slug);
             let html_body = render::markdown_to_html(&item.body);
@@ -151,7 +150,6 @@ fn run(config_path: &Path) -> Result<()> {
             let html = engine.render_content(item, &html_body, &page_path, &config, &nav)?;
             write_output(&output_dir, &content_dir, item, html)?;
         }
-        }
 
         // Render section index
         let page_path = format!("/{}/index.html", section.name);

treefmt.toml

@@ -19,7 +19,7 @@ options  = ["fmt", "-o", "align_entries=true", "-o", "reorder_keys=true"]
 [formatter.prettier]
 command  = "prettier"
 excludes = ["*/sources.json"]
-includes = ["*.json", "*.md", "*.yaml", "*.yml", "*.html"]
+includes = ["*.json", "*.md", "*.yaml", "*.yml"]
 options  = ["--write"]
 
 [formatter.rustfmt]