Set up prettier and tailwind even harder

JS tooling breaks at the slightest whiff of nonstandard setups. God
forbid you set up your js project in a subdirectory of the repository
instead of in the root...

tailwind.config.ts

@@ -0,0 +1,2 @@
+// Even though tailwind 4 no longer uses this config file, it is required for
+// the tailwind intellisense vscode extension.