Collect and move the support entries that make more sense on a dev faq

We have quite a bit of content on the current support site, and more in the queue to be added, that isn't really aimed at supporting users who are trying to use our software.

For examples, I am thinking:

• The alternate Tor design ideas, like "You should send padding so it's more secure." (#232)

• Tor Browser explanations for power users or other devs, like "Why is Tor Browser built from Firefox and not some other browser?" (https://support.torproject.org/tbb/tbb-4/)

• Instructions for relay operators to help debug and diagnose the network, and generally participate in network health things, like the new details we added to https://support.torproject.org/#relay-operators_why-is-my-relay-slow in #352 (closed)

We should collect these various support entries, and move them out of the main support portal, so we aren't diluting our actual support entries.

Where should they go?

One simple option would be to put them at the bottom of the support portal, in an 'advanced power user now you're part of tor' section.

Is there some way to fit them onto the dev portal? Like a dev portal faq? After all, each of them is more like a gateway to turning users into developers.