feat!: align standard captures with upstream

Problem: Sharing highlight queries with upstream tree-sitter and
Helix is difficult.

Solution: Where reasonable, use capture names in tree-sitter's standard
list or Helix's Atom-style hierarchy.

Specifically:

* tree-sitter "standard capture names"
  (3f44b89685/highlight/src/lib.rs (L20-L72)):

  - `@parameter` -> `@variable.parameter`
  - `@field` -> `@variable.member`
  - `@namespace` -> `@module`
  - `@float` -> `@number.float`
  - `@symbol` -> `@string.special.symbol`
  - `@string.regex` -> `@string.regexp`
  - `@text.*` -> `@markup.*` (`strong`, `italic`, `link`, `strikethrough`; with exceptions; see below)
  - `@text.title` -> `@markup.heading`
  - `@text.literal` -> `@markup.raw`
  - `@text.reference` -> `@markup.link`
  - `@text.uri` -> `@markup.link.url` (in markup links)
  - `@string.special` -> `@markup.link.label` (non-url links)
  - `@punctuation.special` -> `@markup.list` (markdown lists only; move subitems from `@text.todo`)

* Helix captures
  (https://docs.helix-editor.com/master/themes.html#syntax-highlighting):

  - `@method` -> `@function.method`
  - `@method.call` -> `@function.method.call`
  - `@text.{todo,warning,note,danger}` -> `@comment.{error,warning,hint,info,todo}`
  - `@text.diff.{add,delete,}` -> `@diff.{plus,minus,delta}`
  - `@text.uri` -> `@string.special.url` (outside markup)
  - `@preproc` -> `@keyword.directive`
  - `@define` -> `@keyword.directive`(`.define`?)
  - `@storageclass` -> `@keyword.storage`
  - `@conditional` -> `@keyword.conditional`
  - `@debug` -> `@keyword.debug`
  - `@exception` -> `@keyword.exception`
  - `@include` -> `@keyword.import`
  - `@repeat` -> `@keyword.repeat`

* cleanup

  - remove some redundant `@conceal` (but still allow it for conceal-only patterns)
  - remove obsolete `@error` (syntax linting is out of scope for this repo)
  - sort, cleanup capture list in `CONTRIBUTING.md`

queries/markdown/highlights.scm

@@ -1,38 +1,54 @@
 ;From MDeiml/tree-sitter-markdown & Helix
-(setext_heading (paragraph) @text.title.1 (setext_h1_underline) @text.title.1.marker)
-(setext_heading (paragraph) @text.title.2 (setext_h2_underline) @text.title.2.marker)
+(setext_heading (paragraph) @markup.heading.1 (setext_h1_underline) @markup.heading.1.marker)
+(setext_heading (paragraph) @markup.heading.2 (setext_h2_underline) @markup.heading.2.marker)
 
-(atx_heading (atx_h1_marker) @text.title.1.marker (inline) @text.title.1)
-(atx_heading (atx_h2_marker) @text.title.2.marker (inline) @text.title.2)
-(atx_heading (atx_h3_marker) @text.title.3.marker (inline) @text.title.3)
-(atx_heading (atx_h4_marker) @text.title.4.marker (inline) @text.title.4)
-(atx_heading (atx_h5_marker) @text.title.5.marker (inline) @text.title.5)
-(atx_heading (atx_h6_marker) @text.title.6.marker (inline) @text.title.6)
-
-(link_title) @text.literal
-(indented_code_block) @text.literal.block
-((fenced_code_block) @text.literal.block (#set! "priority" 90))
+(atx_heading (atx_h1_marker) @markup.heading.1.marker (inline) @markup.heading.1)
+(atx_heading (atx_h2_marker) @markup.heading.2.marker (inline) @markup.heading.2)
+(atx_heading (atx_h3_marker) @markup.heading.3.marker (inline) @markup.heading.3)
+(atx_heading (atx_h4_marker) @markup.heading.4.marker (inline) @markup.heading.4)
+(atx_heading (atx_h5_marker) @markup.heading.5.marker (inline) @markup.heading.5)
+(atx_heading (atx_h6_marker) @markup.heading.6.marker (inline) @markup.heading.6)
 
 (info_string) @label
 
-(pipe_table_header (pipe_table_cell) @text.title)
+(pipe_table_header (pipe_table_cell) @markup.heading)
 
 (pipe_table_header "|" @punctuation.special)
 (pipe_table_row "|" @punctuation.special)
 (pipe_table_delimiter_row "|" @punctuation.special)
 (pipe_table_delimiter_cell) @punctuation.special
 
-[
-  (fenced_code_block_delimiter)
-] @punctuation.delimiter
+;; Code blocks (conceal backticks and language annotation)
+(indented_code_block) @markup.raw.block
+
+((fenced_code_block) @markup.raw.block
+  (#set! "priority" 90))
 
-;; Conceal backticks
 (fenced_code_block
   (fenced_code_block_delimiter) @conceal
   (#set! conceal ""))
+
 (fenced_code_block
-  (info_string (language) @conceal
-  (#set! conceal "")))
+  (info_string
+    (language) @conceal
+    (#set! conceal "")))
+
+[
+  (link_destination)
+] @markup.link.url
+
+[
+  (link_title)
+  (link_label)
+] @markup.link.label
+
+[
+  (list_marker_plus)
+  (list_marker_minus)
+  (list_marker_star)
+  (list_marker_dot)
+  (list_marker_parenthesis)
+] @markup.list
 
 ; NOTE: The following has been commented out due to issues with spaces in the
 ; list marker nodes generated by the parser. If those spaces ever get captured
@@ -58,28 +74,12 @@
 
 (code_fence_content) @none
 
-[
-  (link_destination)
-] @text.uri
+(thematic_break) @punctuation.special
 
-[
-  (link_label)
-] @text.reference
+(task_list_marker_unchecked) @markup.list.unchecked
+(task_list_marker_checked) @markup.list.checked
 
-[
-  (list_marker_plus)
-  (list_marker_minus)
-  (list_marker_star)
-  (list_marker_dot)
-  (list_marker_parenthesis)
-  (thematic_break)
-] @punctuation.special
-
-
-(task_list_marker_unchecked) @text.todo.unchecked
-(task_list_marker_checked) @text.todo.checked
-
-((block_quote) @text.quote (#set! "priority" 90))
+((block_quote) @markup.quote (#set! "priority" 90))
 
 [
   (block_continuation)