Fix Staging-Dev conflicts (microsoft#315)

* Release Note March 10 (microsoft#251)

release note modification and removed svgs from readme

* ubuntu setup fixes (microsoft#281)

Hotfix for Ubuntu

* Serial Monitor Fix (microsoft#282)

* changed release note for hotfix

* Merge staging to dev

* Release Note April 15 (microsoft#308)

* added link to readme

* pr feedback

* small fix

* modifications

* removed gestures

* adding bbc to microbit

Co-authored-by: Andrea Mah <31675041+andreamah@users.noreply.github.com>
Co-authored-by: Vandy Liu <33995460+vandyliu@users.noreply.github.com>
Co-authored-by: andreamah <andrea_mah22@hotmail.com>

Author: 3 people