* Published field for podcasts
* Add podcasts migration
* More specs for podcasts availability
* Show published in podcasts internal
* Update schema.rb with db:migrate
* Don't hide podcasts if they have reachable episodes
Recheck episodes' reachability after the podcast status is set to
unreachable
* Update db/schema.rb
* Fix GetEpisodesJob specs
* Fix stories spec
* Episodes are reachable even if the podcast is unreachable
* Improve the Podcast.reachable query
* Fix podcasts root page spec
* Add index concurrently
* Allow users to follow podcasts
* Only display podcasts user follows
* Add main_color_hex to factory
* Fix podcast test and modify styles
* Fix tests
* Remove weird test