Final template refinements #49299
Description
This is just to track that I have a few minor refinements in mind for the template to make the code cleaner and simpler. I'll add details later.
This also includes ensuring the toggle-nav-menu feature works in a pure SSR mode.
Also we need to stop including the whole of bootstrap-icons. Currently the default template transfers ~380KB of CSS+WOFF2 to the browser (running the dotnet publish -c Release output), which is hugely disproportionate to what it does.