First version of the Video embed PeerTube module:
- Contains a provider that allows to integrate PeerTube videos in video embed field
- Simple detection to know if a website is a PeerTube instance based on the /api/v1/config JSON.
Replaced the obsolete webpack-serve with no-longer-obsolete webpack-dev-server (one love - JS :*).
Made drush webpack:serve work inside docker in single-container mode and in multi-container mode (when drush PHP is separate from webserver's PHP).