Add #android-firehose and add hyperlinks to the IRC channels themselves,
because we're using the HTML!
Change-Id: I4704235a00afe6b48187774debb80a101f304266
This change fixes some formatting artifacts that resulted from the export from
Sites, and also updates links to no longer point to Sites and use the standard
{@docRoot} idiom. Also contains a few content updates, and introduces a page
about branch management.