#1247 docs(native-navigation): Android navbar segments demo, smaller recordings

Follow-up to #1246.

• Adds an Android recording of navbar segment rows (`navbar-segments-android.webp`, 311 KB).
• Re-encodes the iOS recording at 320px (771 KB; it was 1.1 MB).
• Getting started and the tutorial now show an iOS | Android table at `width="160"` instead of one large 280px image.
• The Demo table on the docs index gets an Android column.

Plugin README counterpart: https://github.com/Cap-go/capacitor-native-navigation/pull/87

🤖 Generated with Claude Code

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