Remove the global activity feed. No one is using it so lets save some queries.

opentech/apply/activity/views.py

...h/apply/funds/templates/funds/includes/activity-feed.html

opentech/apply/funds/templates/funds/submissions.html

...ech/apply/funds/templates/funds/submissions_by_round.html

...ech/apply/funds/templates/funds/submissions_overview.html

opentech/apply/funds/views.py

opentech/static_src/src/javascript/apply/activity-feed.js

.../static_src/src/sass/apply/components/_activity-feed.scss

opentech/static_src/src/sass/apply/main.scss