Docs: Overhaul README

[hannesrudolph]

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Important

Overhauls README.md with a new structure, updated content, and additional sections to enhance user guidance and clarity.

• README Overhaul:
  • Reorganized structure for clarity and ease of navigation.
  • Updated introduction to emphasize Roo Code's divergence from Cline.
  • Added detailed sections on features, modes, and resources.
  • Included tutorial and feature video links for better user guidance.
  • Enhanced community and contribution sections with clear calls to action.
  • Added disclaimer and licensing information for transparency.

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