* docs: Update CI Badge Branch Name

The CI badges were still pointing at builds for the master branch, which
are stale since the rename to main.

* docs: Update electron/electron Branch Name

Update electron/electron branch name from master to main.

* docs: Update electron/governance Branch Name

Update electron/governance branch name from master to main.

We have a check for this now, so the checklist item is redundant

* chore: clean up issue templates

* address feedback from review

* cleanup

* chore: update PR template for new notes bot

* include link to release note readme

This PR updates the Pull Request template so that contributors see a clearer checklist of items they need to complete in order to have a given PR reviewed and landed.