am 21111c2c: am f7a8c0f7: cherrypick Change-Id: Icf0c7772901f742c36ba417e07cc5e299f72849a fix broken links, update the dev guide intro, and update sitemap file

* commit '21111c2cddff2a62b2de0afe9e70607cc4054e54':
  cherrypick Change-Id: Icf0c7772901f742c36ba417e07cc5e299f72849a fix broken links, update the dev guide intro, and update sitemap file
tree: 55c3aa1bb64fb7d5886dcfeeae34ffad7206e34d
  1. cmds/
  2. include/
  3. libs/
  4. opengl/
  5. services/
  6. vpn/
  7. MODULE_LICENSE_APACHE2
  8. NOTICE