chromium-status: add header of useful links
chromium-status: add header of useful links

There are a bunch of useful sub-pages in this app, so add links to them
in the dead whitespace at the top.

BUG=chromium:314501
TEST=ran an appengine instance and checked the links at the top work
TEST=`./tests/main_test.py` passes

Review URL: https://codereview.chromium.org/47233004

git-svn-id: fcf5dad22b2b9f051ac9862410c0bc750906fb3b@239623 0039d316-1c4b-4281-b951-d872f2087c98

nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra