feat(treesitter): replace nvim-treesitter with pack-managed parsers

queries/gitcommit/highlights.scm

@@ -0,0 +1,52 @@
+; SPDX-License-Identifier: Apache-2.0
+; Source: nvim-treesitter (https://github.com/nvim-treesitter/nvim-treesitter)
+
+(comment) @comment
+
+(generated_comment) @comment
+
+(title) @markup.heading
+
+; (text) @none
+(branch) @markup.link
+
+(change) @keyword
+
+(filepath) @string.special.path
+
+(arrow) @punctuation.delimiter
+
+(subject) @markup.heading @spell
+
+(subject
+  (subject_prefix) @function @nospell)
+
+(prefix
+  (type) @keyword @nospell)
+
+(prefix
+  (scope) @variable.parameter @nospell)
+
+(prefix
+  [
+    "("
+    ")"
+    ":"
+  ] @punctuation.delimiter)
+
+(prefix
+  "!" @punctuation.special)
+
+(message) @spell
+
+(trailer
+  (token) @label)
+
+; (trailer (value) @none)
+(breaking_change
+  (token) @comment.error)
+
+(breaking_change
+  (value) @none @spell)
+
+(scissor) @comment