Pro feed activity deletion. #2381

Summary

Closes #2381 (closed) On pro feeds, right now if you delete an activity it is not removed from the page.

Steps to test

1. Log into a pro channel.
2. Go to your pro page.
3. Click feeds on the topbar.
4. Pick an activity - delete it.
5. Activity should be removed from feed.

Estimated Regression Scope

Touched files:

• Adding the Output to the activity should not bare any risk.
• The HTML is straightforward.
• The core of the logic; I added a catch to the rxjs observable so in the worst case, the feed should return untouched in the event of an error.