Fix Tailwind CSS completions

Whether the file extension is `.twig` or `.html.twig`, the filetype in
Neovim is `twig`, so this commit simplifies and fixes the configuration
for Tailwind CSS so that it works in files it previously wasn't
completing in.

lua/opdavies/lsp/init.lua

@@ -99,7 +99,7 @@ local servers = {
   marksman = {},
   nil_ls = {},
   tailwindcss = {
-    filetypes = { "html", "html.twig", "javascript", "typescript", "vue" },
+    filetypes = { "html", "javascript", "twig", "typescript", "vue" },
 
     settings = {
       init_options = {