PrivatePreview 2021-03-19-1507

[#2382732] Adding customization markdown to docs. (#83)

* [#2382732] Adding customization markdown to docs.

* [#2382732] Adding details on responsive device testing

* [#2382732] Making examples generic

PrivatePreview 2021-03-12-1507

Auto deploy GroupCall sample (#69)

* testing deploy workflow

* commenting out the chat deployment for now

* just deleting chat deployment for now

* Adding chat back into deploy to azure script

* renaming job name

* Not auto-updating chat due to erasing chat thread storage on every update

* updating release yaml and suggested fixes for deployment

* fixing some nits

Co-authored-by: James Burnside <[email protected]>