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/v/highlights.scm

@@ -3,7 +3,7 @@
 [
   "import"
   "module"
-] @include
+] @keyword.import
 
 ; Keywords
 
@@ -38,14 +38,14 @@
   "else"
   "$else"
   "select"
-] @conditional
+] @keyword.conditional
 
 [
   "for"
   "$for"
   "continue"
   "break"
-] @repeat
+] @keyword.repeat
 
 "fn" @keyword.function
 
@@ -56,7 +56,7 @@
   "shared"
   "static"
   "const"
-] @storageclass
+] @keyword.storage
 
 [
   "pub"
@@ -77,13 +77,13 @@
 ; Namespace
 
 (module_clause
- (identifier) @namespace)
+ (identifier) @module)
 
 (import_path
- (import_name) @namespace)
+ (import_name) @module)
 
 (import_alias
- (import_name) @namespace)
+ (import_name) @module)
 
 ; Literals
 
@@ -115,20 +115,20 @@
 
 ; Fields
 
-(selector_expression field: (reference_expression (identifier) @field))
+(selector_expression field: (reference_expression (identifier) @variable.member))
 
-(field_name) @field
+(field_name) @variable.member
 
 (struct_field_declaration
-  name: (identifier) @field)
+  name: (identifier) @variable.member)
 
 ; Parameters
 
 (parameter_declaration
-  name: (identifier) @parameter)
+  name: (identifier) @variable.parameter)
 
 (receiver
-  name: (identifier) @parameter)
+  name: (identifier) @variable.parameter)
 
 ; Constants
 
@@ -158,11 +158,11 @@
 
 (function_declaration
   receiver: (receiver)
-  name: (identifier) @method)
+  name: (identifier) @function.method)
 
 (call_expression
  name: (selector_expression
-  field: (reference_expression) @method.call))
+  field: (reference_expression) @function.method.call))
 
 (call_expression
  name: (reference_expression) @function.call)
@@ -428,7 +428,7 @@
 
 (int_literal) @number
 
-(float_literal) @float
+(float_literal) @number.float
 
 [
   (c_string_literal)