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/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);
@@ -215,15 +275,15 @@ th {
   body {
     grid-template-columns: 1fr;
   }
-  
+
   .sidebar {
     position: static;
     height: auto;
     border-right: none;
     border-bottom: 1px solid var(--border);
   }
-  
+
   main {
     padding: 2rem 1.5rem;
   }
-}
+}