Make username clickable in RHS PRs/Issues

[mickmister]

The author of a PR/issue is shown at the bottom of each entry in the RHS. We can have the username be a hyperlink to the author's GitHub profile.

[djanda97]

@mickmister Thanks for the feedback you posted on my PR! I'll make those changes and work on getting my environment setup so that I will be able to test changes locally.

[hanzei]

@adithyaakrishna is working on this