refactor: Renaming to MCP Proxy for AWS

[arangatang]

Summary

Changing name to MCP Proxy for AWS

Changes

Changed the names from AWS MCP Proxy to MCP Proxy for AWS

User experience

Users should be able to run the proxy with uvx mcp-proxy-for-aws going forward.

Checklist

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• I have reviewed the contributing guidelines
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Is this a breaking change? (Y/N)

• Yes
• No

Please add details about how this change was tested.

• Did integration tests succeed?
• If the feature is a new use case, is it necessary to add a new integration test case?

Acknowledgment

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