feat(highlight): migrate to tree-house with Helix queries

Replace tree-sitter-highlight dep with tree-house crate from Helix
editor. Add ropey dependency required by tree-house.

Reorganize query files from Helix's runtime/queries/ for all 14
supported languages:
- bash, c, css, go, html, javascript, json, markdown, nix, python,
  rust, toml, typescript, yaml
- Include ecma, _javascript, _typescript base dirs for JS/TS inheritance
- Copy highlights.scm, injections.scm, locals.scm where available

This commit establishes the foundation; highlight.rs implementation
will follow in subsequent commits.

queries/markdown/highlights.scm

@@ -0,0 +1,62 @@
+
+(setext_heading (paragraph) @markup.heading.1 (setext_h1_underline) @markup.heading.marker)
+(setext_heading (paragraph) @markup.heading.2 (setext_h2_underline) @markup.heading.marker)
+
+(atx_heading (atx_h1_marker) @markup.heading.marker) @markup.heading.1
+(atx_heading (atx_h2_marker) @markup.heading.marker) @markup.heading.2
+(atx_heading (atx_h3_marker) @markup.heading.marker) @markup.heading.3
+(atx_heading (atx_h4_marker) @markup.heading.marker) @markup.heading.4
+(atx_heading (atx_h5_marker) @markup.heading.marker) @markup.heading.5
+(atx_heading (atx_h6_marker) @markup.heading.marker) @markup.heading.6
+
+[
+  (indented_code_block)
+  (fenced_code_block)
+] @markup.raw.block
+
+(info_string) @label
+
+[
+  (fenced_code_block_delimiter)
+] @punctuation.bracket
+
+[
+  (link_destination)
+] @markup.link.url
+
+[
+  (link_label)
+] @markup.link.label
+
+[
+  (list_marker_plus)
+  (list_marker_minus)
+  (list_marker_star)
+] @markup.list.unnumbered
+
+[
+  (list_marker_dot)
+  (list_marker_parenthesis)
+] @markup.list.numbered
+
+(task_list_marker_checked) @markup.list.checked
+(task_list_marker_unchecked) @markup.list.unchecked
+
+(thematic_break) @punctuation.special
+
+[
+  (block_continuation)
+  (block_quote_marker)
+] @punctuation.special
+
+[
+  (backslash_escape)
+] @string.escape
+
+(block_quote) @markup.quote
+
+(pipe_table_row
+  "|" @punctuation.special)
+(pipe_table_header
+  "|" @punctuation.special)
+(pipe_table_delimiter_row) @punctuation.special