META: write up lessons learned from D8MUX navigation prototype

Problem/Motivation

The http://nav.d8mux.org/ prototype has completed phase 1 of its exploration of mobile navigation techniques.

But we need to take what we learned from there and implement what we learned!

Proposed resolution

Write up the lessons learned, then implement them.

Remaining tasks

First, Lewis needs to write up all the things we can implement from that prototype. He can do that in the comments of this issue.

Then, we (not Lewis) need to create individual issues for each of those things. And get to work!

:-)

User interface changes

An awesome new mobile navigation in D8.