v3 rollout

[Eomm]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the issue has not already been raised

Issue

To complete the #103 we need to:

1. define the shutdown end date for the external application. I would propose 31th March or the 1st of April 😂
2. implement and release (dismissing app) Block automerge itself for semver major dependabot-merge-action-app#105
3. then implement and release Block automerge itself for semver major #110
4. then release v3 major: remove backing web app #107

[Eomm]

define the shutdown end date for the external application. I would propose 31th March or the 1st of April

Regarding this point: the application will not shout down. So users are not forced to update to v3

[simoneb]

We can consider shutting down the app at some point, but no sooner than after a reasonable time for users to upgrade, which will be a few months at least.

[Eomm]

v3 out!