Clean up Repose main menu

Remove unwanted main menu entries

Currently:

• Home
• REPOSE-Studie
• Symptom Checks
• Questionnaire
• Settings
• Backup & Restore
• Journal Entries
• Reports
• Developer Tools
• Delete all data
• Legal Notice

Desired:

• Home
• Symptom Checks
• Journal Entries
• Settings
• Backup & Restore
• Delete all data
• Legal Notice