UX improvements v1 (#39)

* Removed collection_type user input instead inferring from yt-dlp response

* Updated docs

* Added delete buttons for source; Refactored the way deletion methods work

* Update source to always run an initial index

* Added deletion to the last models

* Improved clarity around deletion operation

* Improved task fetching and deletion methods

* More tests

lib/pinchflat_web/controllers/sources/source_html.ex

@@ -24,11 +24,4 @@ defmodule PinchflatWeb.Sources.SourceHTML do
       {"Monthly", 30 * 24 * 60}
     ]
   end
-
-  def friendly_collection_types do
-    [
-      {"Channel", "channel"},
-      {"Playlist", "playlist"}
-    ]
-  end
 end