More info about the PR in the UI

[aergonaut]

Right now the UI is very sparse. It would be nice to have more information about the PR in the Cody UI.

I think a good example of this is the Travis CI UI:

It shows:

• Head commit hash
• Target branch name
• PR title
• Author user name and avatar
• When the PR was created

I think all of these would be good additions to the Cody UI.