Make links in user messages clickable

[scottpchow23]

Currently, if a link appears in a message it is unclickable.

Note: this feature might be more difficult to implement than first lets on; the primary issue is that React really doesn't like rendering text as HTML. This will most likely require rearchitecting message resolution to return actual React/HTML elements instead of the message objects like it does right now.

Acceptance criteria:

• Any link that appears in a user message should be made clickable (note that the actual link may or may not work, but that is out of scope)