White Labeling - Allow customizing the mobile app deep links

[ClaudeROSSI]

Customers may have their own mobile app. In that situation, the customer should be able to declare which app is to be used when verifying a new user or when changing a password.

So far, the deep links to our mobile apps are hardcoded in method: Utils.buildMobileAppDeepLink()

This must be changed and take into account new tenant settings.

• [x] add a new TAB to the Technical Settings module
• [ ] add properties to declare the mobile apps (for both IOS and Android) - try to minimize the required information
• [ ] also add a link to the official website and take this information into account when generating emails
• [ ] Take this information into account when generating the deep links