Issue #25 : Add option to lock Home screen

[Sinexo]

What is it?

• [ ] Bugfix
• [X] Feature
• [ ] Codebase improvement

Description of the changes in your PR

• Updated Config
• Updated Constant
• Updated Mainactivity
• Updated SettingsActivity
• Updated activity_setting

Fixes the following issue(s)

• [Feature request] Add option to lock Home screen

Relies on the following changes

• Add option in the settings to lock the home screen, no app, pages or widget can be deleted/moved. App can still be unistalled from the app screen.

Acknowledgement

• [X] I read the contribution guidelines.