Update home.css for phx.new --no-tailwind

Pick up template changes (including core components) and Tailwind
upstream changes.

The majority of additions are due to picking up classes referenced in
core_components.ex which were previously not part of the original
home.css installer template.

Used the same Tailwind version as new Phoenix apps to re-generate the
CSS file.

Steps to reproduce:

mix phx.new my_app
mix assets.build
cp priv/static/assets/app.css installer/templates/phx_static/home.css
(retaining the note at the top of the file)

Steps to test the changes:

mix phx.new my_app2 --no-assets
mix phx.server
(verify that app renders as expected)