docs: expand Android SDK overview with detailed features and benefits

[dzienisz]

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[Anty0]

I reviewed the correctness of the info as requested. If there was anything obvious about its appearance, I commented on it too, but it wasn't my main concern. Let's explore how to improve accuracy in the future without my reviews—maybe create a list of things you're unsure about so I can help answer them. It's much easier for me to answer questions than to find inaccuracies in documentation changes like these—especially since a lot of info repeats multiple times. Otherwise, the first impression is definitely better, and I like how it looks from a distance. It still feels quite generated and feels like reading marketing material more than documentation, but we can work on that.

[Anty0]

It appears that the comments on moved files are missing the lines they reference. Let me know if any of them don't provide enough context to understand what they refer to. I'll locate what they referred to and recreate the comment.