Correct docs: dxr-build is the indexer, not dxr-serve.
Changed protocol for trilite submodule
Change folder name that was causing git checkout to fail on Windows.
Restore the missing "bubble" element which somehow got lost. Fixes bug #1039644.
Pull contributors toward the Development page.

I forgot myself that Getting Started wasn't target at developers. Whoops. We should make that even clearer at some point.