Including UX Feedback on menu and nav.

We've gotten some good feedback on the design and navigation for
storyboard, this patch incorporates those changes. Included:

- Header menu now fixed again, includes identity and preferences.
- Left menu switches sides in mobile view.
- Side menu now mainly icon-driven with some annotations.
- Removed pilltabs, other extraneous styles.
- Does not include new logo, will be in second patch.

Change-Id: I63ad9334468fd3ce01eac8eab5397310c7f34a8a
Merge "Including UX Feedback on menu and nav."