"Get Involved" should only refer target audience to developer tab

[JayFoxRox]

Currently, the "Get Involved" contains developer information which shouldn't be relevant to users.

Those end-users who are willing to learn will probably appear in support channels (when we have them) or read developer info anyway, because they'll be highly motivated.

Therefore, I believe that we should only refer users to the developers tab, with a big-fat disclaimer, who the target audience is.

On the developers tab we can then refer to XboxDev and IRC (also see #26).