feat: add tauri proper handling for iOS and Android

[Vexcited]

Also renames package names from old project WIP (portableedp -> ecoledirecteplus) and does a bunch of stuff such as removing the banner during login (like the extension) by replicating the postMessage.

[Vexcited]

Going to add the CI for mobile nightly builds that can be triggered within Actions.
Here's how you should configure the secrets, based on https://tauri.app/distribute/sign/android/ and https://tauri.app/distribute/sign/ios/.

Android

1. Make a keystore using keytool -genkey -v -keystore ~/edp-keystore.jks -keyalg RSA -keysize 2048 -validity 10000 -alias upload and run base64 -i ~/edp-keystore.jks and put the value inside ANDROID_KEY_BASE64 secret.
2. Write the provided password to create the keystore in a secret named ANDROID_KEY_PASSWORD
3. Add secret named ANDROID_KEY_ALIAS with value upload (it's the value given in -alias upload during the keystore creation)

Done !

iOS

1. Go on https://appstoreconnect.apple.com/access/users
2. Click on "Integrations" tab

3. Click on the "+" button to create an API key with "Admin" access.

4. Once created, you'll download the key (which is named AuthKey_<id>.p8)
5. Write the Key ID to APPLE_API_KEY secret
6. Write the Issuer ID to APPLE_API_ISSUER secret
7. Run base64 -i ./AuthKey_<id>.p8 and put the value inside APPLE_API_KEY_BASE64 secret

Done !

Build

You can trigger the build in "Actions".
.apk, .ipa, .exe and more will be dropped as Artifacts in the run's summary.