Add DeFi Rates MCP server (#2836)

* Add DeFi Rates MCP server to third-party list

DeFi Rates is an MCP server providing real-time access to DeFi lending
rates across 13+ major protocols including Aave, Morpho, Compound, Venus,
Solend, Drift, and Jupiter.

Features:
- Query borrow/supply rates across multiple chains
- Compare rates between platforms
- Search for best lending opportunities
- Calculate looping strategy metrics

npm: @asahi001/defi-rates-mcp
Website: https://defiborrow.loan

* Move DeFi Rates to Community Servers section

As requested by maintainers, moved DeFi Rates from Official Integrations
to Community Servers section, maintaining alphabetical order.

* Update README.md

---------

Co-authored-by: adam jones <domdomegg+git@gmail.com>

README.md

@@ -673,6 +673,7 @@ A growing set of community-developed and maintained servers demonstrates various
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