app, admin, install and authentication views are now located in root themes/ folder

- 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

- podcast name was too vague and didn't come clearly for users: handle is more relevant
- update
package.json dependencies and remove unnused packages

closes #126