Imploment a recent activity menu

## What Currently Happens?
Currently when you go to a user, a repository or any organization it only shows the basic info.

## What Would You Like To Happen?

I would like to be able to press a button to have a list with the recent activity from that user, in that repository or in that organization. This is implemented really nicely in iOctocat:

Example:

The images are huge, but they show you what you need to know :+1:

The issue names no files, tests, or entry points to begin with. First inspect how user, repository, and organization screens are implemented and how activity data is accessed, then define the required behavior from the linked iOctocat examples. Done should include a button and recent-activity list for all three entity types.

Written by the indexing model from the issue text.