update php and js dependencies to latest

closes #224

- update CI4 to v4.1.9's stable production package
- update php and js dependencies to latest

- configure service-worker using vite-plugin-pwa
- refactor Image entity to generate images of
different types based on size config
- add requirement for webp library for php gd to generate webp
images for instance
- add action to regenerate all instance images for eventual Images config
changes
- enhance google lighthouse metrics for pwa

- 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

- use vimejs as audio player
- add global audio player + play episode buttons on public pages
-
refactor admin episodes list from a grid to a data table
- arrange episode cards to be more
readable

closes #131

- replace rollup config with vitejs
- use vite dev server during development to take advantage of
hot module replacement (HMR)
- add vite service using Vite library to load css and js assets
- update package.json scripts and remove unnecessary
dependencies
- update scripts/bundle-prepare.sh

closes #107