Adding SIG Process/Workflow Guide and related images (#5565)

* Create process-workflow-guide.md

* Add Triage Party screenshot for process guide

* Add GitHub project board image

* Add Rel Eng project board

* add SIG Node PR triage image

* Add prioritisation framework image

* Update process-workflow-guide.md

* Update process-workflow-guide.md

* Add Storage tracking sheet image

* Add BOM board image

* Update process-workflow-guide.md

* Added some links

* Update contributors/chairs-and-techleads/process-workflow-guide.md

Co-authored-by: Sascha Grunert <[email protected]>

* Update contributors/chairs-and-techleads/process-workflow-guide.md

Co-authored-by: Bob Killen <[email protected]>

* Update contributors/chairs-and-techleads/process-workflow-guide.md

Co-authored-by: Bob Killen <[email protected]>

* Update contributors/chairs-and-techleads/process-workflow-guide.md

Co-authored-by: Bob Killen <[email protected]>

* Update contributors/chairs-and-techleads/process-workflow-guide.md

Co-authored-by: Bob Killen <[email protected]>

* Update contributors/chairs-and-techleads/process-workflow-guide.md

Co-authored-by: Bob Killen <[email protected]>

* Update contributors/chairs-and-techleads/process-workflow-guide.md

Co-authored-by: Bob Killen <[email protected]>

* Typo fixes and tiny edits

* Delete BOM board.png

* Add BOM_board image

* Delete GitHub project board auto.png

* Replaced GH project board image

* Delete Prioritization framework.png

* Replaced prioritization framework image

* Delete Rel Eng snapshot.png

* Replaced Rel Eng snapshot

* Delete SIG Node PR triage.png

* Replacing SIG Node image

* Delete Storage tracking sheet.png

* Add files via upload

* Replaced images in guide

Co-authored-by: Sascha Grunert <[email protected]>
Co-authored-by: Bob Killen <[email protected]>

Author: 3 people