Clean up README.md, remove redundancies and fix code

[ganji759]

Fixes made:

1. Removed duplicate bird classifier code (was appearing twice)
2. Fixed broken YOLO download code (added missing YOLO module and function calls)
3. Reorganized into clear 5-step flow: Download → Convert → Deploy
4. Fixed missing # Python comments
5. Removed the stray "Run it from a regular terminal" text that was inside a code block

[kirklandsign]

@claude review

[Copilot]

Pull request overview

Updates the Android YOLO/ExecuTorch README to remove duplicated content and present a clearer end-to-end workflow for downloading, converting, and deploying the models.

Changes:

• Reformat README into a 5-step flow with clearer headings and code blocks.
• Fix broken YOLO download snippets by adding the missing ultralytics.YOLO usage.
• Clean up stray/duplicated text and improve section formatting (ADB instructions, feature lists).

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[kirklandsign]

Minor nits

• No trailing newline (\ No newline at end of file). Worth adding one back —
  consistent with the rest of the repo.
• Trailing whitespace preserved in the first bird-classifier block (context
  lines 17–21 still have long runs of spaces). Patch didn't touch them since
  they're context; would be nice to strip in the same commit.
• YOLO download snippets switch from python -c "..." one-liners to bare Python
  blocks. That's fine, but a one-line note like "run in a Python REPL or save
  to a file" would help since the previous form was directly executable.
• In the Prerequisites pip install, torch + executorch is fine, but executorch
  typically pins a matching torch — worth mentioning constraints or linking to
  executorch install docs rather than letting pip resolve.

[ganji759]

@kirklandsign let me revisit the changes and keep you posted.

[ganji759]

Thanks for the review @kirklandsign. The updates are addressed in the latest commit.