Moving the rest of the main page to Polymer.

This finishes the reworking of the main page laid
out in polydesign.md.

Same functionality, but across the past four CLs over 200 lines of code have been removed.

NOTREECHECKS=true
BUG=skia:

Review URL: https://codereview.chromium.org/715893002
logserver: Display symlinks at the top and then display logs sectioned by sorted app names.

Change is staged here: http://piraeus.cnc.corp.google.com:10115/

BUG=skia:

Review URL: https://codereview.chromium.org/725623002