copilot: restructure content, editorial improvements

[dvdksn]

• Restructured the content from a single section into multiple pages.
• Removed callouts about extensions being in limited public beta. (Docker extension still EA.)
• Misc editorial improvements.

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[dvdksn]

thanks @krissetto - I did push an update to fix some more of your comments. We can continue to iterate in followups and as the extension evolves