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/bash/injections.scm

@@ -0,0 +1,38 @@
+((comment) @injection.content
+ (#set! injection.language "comment"))
+
+(command
+  name: (command_name (word) @_command)
+  argument: (raw_string) @injection.content
+ (#match? @_command "^[gnm]?awk$")
+ (#set! injection.language "awk"))
+
+((regex) @injection.content
+  (#set! injection.language "regex"))
+
+(command
+  name: (command_name (word) @_command (#any-of? @_command "jq" "jaq"))
+  argument: [
+    (raw_string) @injection.content
+    (string (string_content) @injection.content)
+  ]
+  (#set! injection.language "jq"))
+
+(command
+  name: (command_name (word) @_command (#eq? @_command "alias"))
+  argument: (concatenation
+    (word)
+    [
+      (raw_string) @injection.content
+      (string (string_content) @injection.content)
+    ])
+  (#set! injection.language "bash"))
+
+(command
+  name: (command_name (word) @_command (#any-of? @_command "eval" "trap"))
+  .
+  argument: [
+    (raw_string) @injection.content
+    (string (string_content) @injection.content)
+  ]
+  (#set! injection.language "bash"))