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/injections.scm

@@ -0,0 +1,22 @@
+; From nvim-treesitter/nvim-treesitter
+
+(fenced_code_block
+  (code_fence_content) @injection.shebang @injection.content
+  (#set! injection.include-unnamed-children))
+
+(fenced_code_block
+  (info_string
+    (language) @injection.language)
+  (code_fence_content) @injection.content (#set! injection.include-unnamed-children))
+
+((html_block) @injection.content
+ (#set! injection.language "html")
+ (#set! injection.include-unnamed-children)
+ (#set! injection.combined))
+
+((pipe_table_cell) @injection.content (#set! injection.language "markdown.inline") (#set! injection.include-unnamed-children))
+
+((minus_metadata) @injection.content (#set! injection.language "yaml") (#set! injection.include-unnamed-children))
+((plus_metadata) @injection.content (#set! injection.language "toml") (#set! injection.include-unnamed-children))
+
+((inline) @injection.content (#set! injection.language "markdown.inline") (#set! injection.include-unnamed-children))