Docs changes

[shreyaspimpalgaonkar]

[!IMPORTANT] This pull request updates documentation for contextual chunk enrichment and entity deduplication, and renames a table reference in postgres.py.

• Documentation Updates:
  • Renamed "Contextual Embeddings" to "Contextual Chunk Enrichment" in advanced-graphrag.mdx.
  • Expanded explanation of contextual chunk enrichment and entity deduplication in advanced-graphrag.mdx.
  • Added detailed guide on contextual chunk enrichment in contextual-enrichment.mdx.
  • Updated mint.json to include new documentation paths.
• Code Changes:
  • Renamed table reference from community to community_info in delete_node_via_document_id function in postgres.py.

^{This description was created by for 2f530b8ce4da75438c366815e3c0afd396d4db41. It will automatically update as commits are pushed.}