Chris add ci mtg slides (sonic-net#119)

* Updated diagram

* Update dash-test-workflow-saithrift.md

Added reminder notes.

* Add missing diagram. Should jhave already been in main.

* Add github rule warning against directly committing new artiofacts w/o a PR.

* Revert "Add github rule warning against directly committing new artiofacts w/o a PR."

This reverts commit 1eb50ca.

* Add slides for CI presentation.

Co-authored-by: Michael Miele <v-mimiele@microsoft.com>
Co-authored-by: Chris Sommers <chris.sommers@keysight.com>