Add applinks support for contribution link

[smalluban]

Fixes #1020

• Followed Apple documentation to setup associated domain on ghostery.com
• Configured entitlements in XCode

It looks like everything is configured correctly, but I can't make it work. The domain can be verified here: https://app-site-association.cdn-apple.com/a/v1/www.ghostery.com

To open URL on iOS simulator you can use command:

xcrun simctl openurl booted https://www.ghostery.com/become-a-contributor

[chrmod]

@smalluban looks like https://www.ghostery.com/.well-known/apple-app-site-association was incorrect. I've made a fix, lets try again.

[smalluban]

@chrmod I've checked the app links, and your change seems to help. But unfortunately, the effect is probably not what we expected. The page opens anyway, but there is a "bar" at the top informing you that you can open it in the application. Maybe linking to the account would change something...

But on the SwiftUI side, I give up. This is extremely unintuitive, and I have no idea how to refer to a view to fire a method on it. I was looking for a solution, but of course, it's kind of wild. Maybe it's our implementation because there is no normal routing there.

Here you have a place to make a call: https://github.com/ghostery/ghostery-extension/blob/8a390c9686298e340328f6eb0a392b07dba218dd/extension-manifest-v3/xcode/iOS%20(App)/GhosteryApp.swift