use override to remove test apps that we can't remove by setting GAIA_APP_SRCDIRS; but stop override-removing feedback.gaiamobile.org, which no longer gets added by default
(cherry picked from commit e94003a55d6bee15e85aaf79dbcfa041f19ee265)
move Help link to corner and point it at new docs; remove unused nav elements
(cherry picked from commit 4c526ed9ea967e2e39e272b75b32fc493f5cdb17)
add title to Simulator window (#197)
(cherry picked from commit a03e47eca736bcf49e1d229dc4d5b7aa16978787)