Extract feed routes (#2269)

* Extract feed routes from invidious.cr
* Removes the deprecated route for /feed/top
* Deprecate /view_all_playlist & use /feed/playlists
* Move feed views into their own directory

* Add haltf method to halt current route context
* Change status_code + return blocks to use haltf

* Set appropriate response headers for RSS routes

src/invidious/routes/playlists.cr

@@ -1,29 +1,4 @@
 module Invidious::Routes::Playlists
-  def self.index(env)
-    locale = LOCALES[env.get("preferences").as(Preferences).locale]?
-
-    user = env.get? "user"
-    referer = get_referer(env)
-
-    return env.redirect "/" if user.nil?
-
-    user = user.as(User)
-
-    items_created = PG_DB.query_all("SELECT * FROM playlists WHERE author = $1 AND id LIKE 'IV%' ORDER BY created", user.email, as: InvidiousPlaylist)
-    items_created.map! do |item|
-      item.author = ""
-      item
-    end
-
-    items_saved = PG_DB.query_all("SELECT * FROM playlists WHERE author = $1 AND id NOT LIKE 'IV%' ORDER BY created", user.email, as: InvidiousPlaylist)
-    items_saved.map! do |item|
-      item.author = ""
-      item
-    end
-
-    templated "view_all_playlists"
-  end
-
   def self.new(env)
     locale = LOCALES[env.get("preferences").as(Preferences).locale]?
 
@@ -148,7 +123,7 @@ module Invidious::Routes::Playlists
     PG_DB.exec("DELETE FROM playlist_videos * WHERE plid = $1", plid)
     PG_DB.exec("DELETE FROM playlists * WHERE id = $1", plid)
 
-    env.redirect "/view_all_playlists"
+    env.redirect "/feed/playlists"
   end
 
   def self.edit(env)