Ensure unsaved-changes dialog does not show up when saving intro/outro of a meeting

[elpoelma]

Overview

This PR ensures that the unsaved-changes dialog does not show up when selecting the save and exit button while editing the intro/outro of a meeting.

connected issues and PRs:

None

How to test/reproduce

• Start the application
• Open a meeting and edit the intro or outro
• Select the save and exit button
• Ensure that the unsaved-changes dialog no longer shows up

Challenges/uncertainties

This PR includes some changes in the logic of the intro and outro pages. It ensures that the dirty property is equal to false after having saved the document by clearing the editor property. The editor property then gets reinstated when a new editor instance is created just after saving.

Checks PR readiness

• UI: works on smaller screen sizes
• UI: feedback for any loading/error states
• Check cancel/go-back flows
• Check database state correct when deleting/updating (especially regarding relationships)
• changelog
• npm lint
• no new deprecations