Migrate to Vue 3

[st3iny]

How to use GitHub

• Please use the 👍 reaction to show that you are interested into the same feature.
• Please don't comment if you have no relevant information to add. It's just extra noise for everyone subscribed to this issue.
• Subscribe to receive notifications on status change and new comments.

---

Feature request

Is your feature request related to a problem? Please describe.
This app is still based on Vue 2 which has been end-of-life for a long time now. It should be migrated to Vue 3.

Describe the solution you'd like
The app should be migrated to Vue 3. A concrete plan with actionable steps is still pending.

Describe alternatives you've considered
None

Additional context
None