Adds instructions for using the tab bar, moves tab layout docs to new
location with redirect, adds instructions for magnifying a block, cleans
up intro text.
I'm updating the magnify button to be always visible and animate a
transition between being a "Magnify" button and a "Minimize" button.
This also cleans up some text shrinking behavior in the block frame
header so the end icons are always visible.
Also fixes some height discrepancies in the block frame header.
Also implements a `prefers-reduced-motion` query for the tilelayout and
block frame to ensure transitions are not set if the user does not want
them.
