[Formulus] Remove form management from "more" menu

[r0ssing]

Component

• formulus (React Native mobile app)
• formulus-formplayer (React web app)
• synkronus (Go backend server)
• synkronus-cli (Command-line utility)
• Documentation
• Other (please specify)

Feature Description

We still have the "old" form management screen accessible from the menu - perhaps we should remove it and rely fully on the Forms and Observations screens?

[r0ssing]

Please self-assing @Jexsie

[najuna-brian]

Hello @Jexsie, are you still having a look into this?

[Jexsie]

You can take over @najuna-brian