Add search UI for querying by GitHub data

[humphd]

In #2832 we're adding routes to the search service to allow querying by GitHub data in old student posts. We'll also need updates to our UI (web/mobile) to let us use this.

[aserputov]

Waiting for backend to support this one.

[humphd]

cc @Andrewnt219

[Andrewnt219]

I'll look into it on the weekend @aserputov

[AmasiaNalbandian]

We already have the parsing logic from the GitHub Info, would help to review Abdul's PR that refactored it.

From there, we can have a search field where users can add the github username. So for example, if we search for AmasiaNalbandian we will add this in the post query to look for https://github.com/AmasiaNalbandian

So I think this should be split into parts, because we can look for multiple things here:

1. Github profiles
2. Github organizations
3. Github repositories