update tailwind to v3.0.0-alpha with its official plugins (forms, typography)

fix components in follow and remote action pages by calling new instances directly

- add rounded classes with conditional border-radius depending on screen width
- add ring-castopod
class to use on focus states

- add About podcast page
- use different layout for episode pages
- improve on user feedback with
design
- restructure app theme folders
- update js packages to latest versions