nvim: Replace clangd with ccls

Updating clangd did indeed not help. Maybe this fork of clangd fixed it
or something.

dotfiles/nvim/lua/plugins/lsp/c.lua

@@ -1,5 +1,5 @@
 return function ()
-  require"lspconfig".clangd.setup {
+  require"lspconfig".ccls.setup {
     capabilities = require"cmp_nvim_lsp".default_capabilities()
   }
 end

modules/packages/nvim.nix

@@ -18,7 +18,7 @@
         lua-language-server
         nodePackages.intelephense
         nodePackages.typescript-language-server
-        llvmPackages_19.clang-tools
+        ccls
         ripgrep
         nil
         gcc