Add a fancy new Wiki button to the navigation bar

[rednet]

See title.

I made a mockup using Inspect Element and GIMP:

[Lignum]

Incidentally, we're already working on this! This was supposed to be in the initial release, but evidently, things didn't work out that way :P. So, hopefully, you should see this in your navbar in the upcoming days.

[Yemmel]

Here is the inter-site navigation menu we currently have implemented on the bleeding branch.

[Dilene]

This is already live

[HydroNitrogen]

Looking good! Thank you guys and girls!