docs: fixed getting started page

[mubashir1osmani]

Title

getting started page for proxy, and virtual keys made more clear

Relevant issues

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• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
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Type

📖 Documentation

[vercel]

@mubashir1osmani is attempting to deploy a commit to the CLERKIEAI Team on Vercel.

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[krrishdholakia]

@mubashir1osmani why the deletions?

[mubashir1osmani]

where specifically? @krrishdholakia

• i brought mcp & observability on the front page so its easier to find
• getting started page was incomplete for proxy server so added more info