Updating docs nav structure to make Platform first class citizen v2

[kbarnard10]

Background

Updating the documentation navigation to create a section for Platform and moving AutoGPT Classic documentation to separate section. Cleaned up from original PR and incorporating that feedback.

Changes 🏗️

• Revised navigation structure to move classic to own section (no documentation changes)
• Renaming "docs" to "contribute"
• Renaming "setup" to "getting started"
• Adding video to platform getting started documentation
• Updated favicon
• New homepage copy based on approved blog copy

[CLAassistant]

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2 out of 3 committers have signed the CLA.

✅ kbarnard10
✅ Torantulino
❌ Kaitlyn Barnard

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[github-actions]

This pull request has conflicts with the base branch, please resolve those so we can evaluate the pull request.

[github-actions]

This PR targets the master branch but does not come from dev or a hotfix/* branch.

Automatically setting the base branch to dev.

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 4 🔵🔵🔵🔵⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Content Update The index page has been significantly rewritten to focus on the AutoGPT Platform rather than the previous components. Verify that all new content accurately represents the current state and features of the platform. New File This is a new file detailing basic operation blocks. Ensure all block descriptions are accurate and complete. New File This new file describes text processing blocks. Verify that all block functionalities are correctly explained.

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[github-actions]

Conflicts have been resolved! 🎉 A maintainer will review the pull request shortly.