update composer dependencies to latest

closes #222

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

remove cache when adding comment and replies as well

fixes #169

- rename podlibre to adaures
- rename castopod-host to castopod
- simplify README and redirect to docs site
- move INSTALL and UPDATE docs
- add new gitlabci pipeline to deploy docs
- upgrade node to v16 in Dockerfile

- refactor meta-tags by generating them in the controller and injecting them into the views
- use
`melbahja/seo` library to build opengraph and twitter meta-tags + schema.org objects

- 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

- update Component class structure and remove component helper function and ComponentLoader
- update residual activitypub naming to fediverse

- create Admin, Analytics, Auth, Fediverse and Install modules in the root modules/ folder
- rename
ActivityPub to Fediverse