HasDropDown doc
KeyNav doc
place and popup documentation
typematic doc
uacss doc
ViewPort doc
update custom elements 101
update index.md
update migration doc
doc for focus
handlebars doc: fix typo, cleanup
fix register
cleanup  theme.md to work w/jekyll and for recent theme.js changes
fix typo in DisplayContainer doc
Selection doc: remove link to non-existant page
clean up Widget doc