UI Enhancements

[Extheoisah]

A couple of things to add to the UI:

• A user should be able to navigate to the homepage when signed in. One suggestion is to have a pop-up attached to the Github avatar image so that when the avatar is clicked, it shows "home", "signout", "connected repos", etc.
• Show a list of repositories for which the FreshEyes bot has been installed.
• The repo suggestion tags should have a title like "Try cloning some of these repositories to see how FreshEyes".
• The suggestion cards should have a short description e.g. the title of the pull request to be cloned.
• Logo should be clickable and redirect users to the homepage

[Extheoisah]

Feedback from @aassoiants on the PR suggestion cards: One suggestion is to have the 4 prepopulated cards autofill the input fields on a click, instead of creating a popup. That's more intuitive and educates on what the product does