Add 'home' icon

Add a plain-text icon that brings us
back to root / home.

Change-Id: I310f693cf0c5685ec4c494fb9e5598c146d973c9
Hide 'home' icon when using the note area

As a general principle we want to get out of
the way as much as possible while making notes.

Change-Id: I58b89bc12b957bcab4cdb6a320fb0fdc8a399d24
UX: Make the note area less harsh

Soften the edges of the note area, so that
it flows more natrually with the rest of
the page.

Change-Id: Ic6078e2da74602d4e64c847a82a64b78d3f647bc