feat: Onboarding education

[validcube]

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Feature description

Provide education or "guide" to newcomer or ReVanced Manager Flutter user during migration to Compose variant,

• this should be turn on by default
• this must be shown at least once
• In any case the design is missing out some UI aspect, feel free to leave it into your interpretation or pinged me to death in Discord

During development a debug option can be offered to reset onboarding education trigger so that the page can always be replicated without clearing data 10000 times.

Motivation

https://www.figma.com/design/ONBQjUCpPTvcMeo5oZUMVE/ReVanced-Concept?node-id=57338-7062&t=l6frcllpZfmUu7PA-0

📲 Copybara! This design is only available in Community variant of ReVanced Concept in 💊 ReVanced Manager Compose page!

And yes, I did took inspiration from Windows XP/Longhorn/Vista OS installer solely because it's cool

Acknowledgements

• [x] I have checked all open and closed feature requests and this is not a duplicate.
• [x] I have chosen an appropriate title.
• [x] The feature request is only related to ReVanced Manager.