Analyze Social Notes

## Description
At the address `/analyze/social/(:note_id)` the page will update the feed when another snippet is added to a note in the same class. Right now the only way to simulate this is with incognito browsers.

I've added links on the dashboard to get to this page for each note as well as the other analysis pages.

I've **updated the database** as well, so the command `./db load` will need to be run in the schema directory.