fix: enhance Google authentication components

This commit contains multiple refinements for the Google authentication components:

1. CSS rules for hovering over the "quiqqer-auth-google-registration-btn" button have been added.
This provides better feedback on user interaction.
2. In the JavaScript files, the code handling button creation and insertion into the container for
the login control has been revised for better accuracy.
3. Dependencies in the "composer.json" have been updated to their newer versions. Moreover,
unnecessary white spaces have been reduced for better readability.
4. The "autoLogin" configuration has been deleted from "settings.xml".
5. In "Login.html", the previous invisible token field has been replaced with a login button. This
gives users an awareness of the authentication process with Google.
6. In the "Login.php", CSS file "Google.css" has been attached if it exists. It helps in
maintaining a clean and consistent look for the login control.