[abeant]

Summary

• Replace the three inline README screenshots with Hansel's two-row captioned table so the images read as Pick one app / Make it home / Settings, one double-tap away.
• Drop the standalone BOOX Nova Air line; that device is already listed under Compatibility.
• Add a short Pairs with Hansel section: Gretel makes KOReader the home screen, Hansel makes Grimmory the first thing KOReader shows, and they stay independent.

Test plan

• Confirm the three screenshots and captions render in a row on the GitHub README preview.
• Confirm the Hansel link goes to https://github.com/abeant/hansel.koplugin.

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