Add a link to the goonstation public github repo to the top of the forums

[kyle2143]

Add another link in the bar on top that includes the wiki, goonhub, and the search icon right below the logo. 

I know there's links to it in other parts of the forums here and there, but I think it would be good to put it in a prominent place like that.

[pali6]

Good idea, someone call Wire.

[kyle2143]

Yeah, I was gonna call out wire in my post, but then I'm like, "no". And I didn't.

[Wire]

And lo it is done.

[Lady Birb]

Don't forget goonhub!