[nvim] Fix path to Stylua

.luarc.json

@@ -1,3 +1,4 @@
 {
-    "workspace.checkThirdParty": false
-}
+  "workspace.checkThirdParty": false,
+  "workspace.library": ["${3rd}/luassert/library", "${3rd}/luv/library"]
+}

nvim/coc-languages/lua.vim

@@ -1,4 +1,10 @@
 if !has('nvim-0.2.1') | finish | endif
 call extend(g:dotfiles_coc_extensions, {'coc-stylua': 1})
 let g:coc_user_config['coc.preferences.formatOnSaveFiletypes'] = ['lua']
-let g:coc_user_config['stylua.styluaPath'] = "/usr/bin/stylua"
+
+" We're using Nix here, so point to the right path...
+if has('macunix')
+  let g:coc_user_config['stylua.styluaPath'] = "/etc/profiles/per-user/alyxia/bin/stylua"
+else
+  let g:coc_user_config['stylua.styluaPath'] = "/usr/bin/stylua"
+endif