neovim: Enable treesitter highlighting

This works, however some of the syntax highlighting with treesitter
feels worse compared to the default syntax highlighting, so it may be
more useful to keep it disabled.

home/neovim.nix

@@ -603,6 +603,19 @@ in
           }
         '';
       }
+      {
+        plugin = nvim-treesitter.withAllGrammars;
+        type = "lua";
+        config = /* lua */ ''
+          require'nvim-treesitter.configs'.setup {
+            highlight = {
+              enable = true,
+              disable = { "rust" },
+              additional_vim_regex_highlighting = true,
+            },
+          }
+        '';
+      }
       cosco-vim
       fzf-vim
       vim-caddyfile
@@ -626,7 +639,6 @@ in
       vim-svelte
       typst-vim
       emmet-vim
-      nvim-treesitter.withAllGrammars
       tagbar
       yats-vim
     ];