fix(treesitter): elixir module/atom colors (#366)

* fix(Color): use proper Elixir module/atom colors

* fix(treesitter): elixir module/atom colors

- Fix highlight of modules (module names) in elixir.

- Link `@string.special.symbol` -> `@constant`, which fixes/improves the
  highlight of symbols/atoms in elixir.

NOTE: Technically, github.com uses the string color (i.e. `@string`) for
      elixir atoms currently, but other langs (e.g. Ruby) use the
      constant (i.e. `@constant`) color. We'll let elixir use the
      default of `@constant` for now for consistency and simplicity.

---------

Co-authored-by: Tyler Miller <[email protected]>

CHANGELOG.md

@@ -17,6 +17,7 @@ The format is based on [Keep a Changelog], and this project adheres to [Semantic
 -  Fixed JSX/TSX tags are missing highlights with nvim 0.10 (#360)
 -  Fixed loading palette or spec before colorscheme disrupts colors (#362 fixed-by #363)
 -  Fixed incorrect highlight of name/binding in python import statements (#371)
+-  Fixed elixir module/atom colors (#366)
 
 ## [v1.1.2] - 05 August 2024
 

lua/github-theme/group/modules/treesitter.lua

@@ -80,7 +80,7 @@ If you want to stay on nvim 0.7, disable the module, or track on 'v0.0.x' branch
     ['@string.escape']            = { fg = syn.regex, style = 'bold' },                         -- Escape characters within a string: `\n`, `\t`, etc.
 
  -- ['@string.special']           = { link = 'Special' },                                       -- Other special strings (e.g. dates)
-    ['@string.special.symbol']    = { fg = syn.preproc },                                       -- Symbols or atoms
+    ['@string.special.symbol']    = { link = '@constant' },                                     -- Symbols or atoms
     ['@string.special.url']       = { fg = syn.const, style = 'italic,underline'  },            -- URIs (e.g. hyperlinks)
  -- ['@string.special.path']      = { fg = spec.palette.done.fg  },                             -- Filenames
 
@@ -307,6 +307,9 @@ If you want to stay on nvim 0.7, disable the module, or track on 'v0.0.x' branch
     ['@label.ruby']                             = { fg = syn.const },
     ['@string.special.symbol.ruby']             = { link = '@constant' },
 
+    -- Elixir
+    ['@module.elixir']                          = { link = '@type' },
+
     -- Rust
     ['@constant.builtin.rust']                     = { fg = pl.syntax.variable },
     ['@module.rust']                               = FALLBACK_OR_NONE,