Update README.md

Merge branch 'main' of github.com:Kohnnn/n8n-template-and-documentation-for-RAG

Refine README.md to clarify the n8n.io-templates section and enhance the description of categorized workflow examples.

Update README.md to credit contributors and reorganize workflow examples; remove outdated templates from n8n.io-templates directory.

Update README.md

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