docs: Add Milvus Standalone to documentation

[markperfect]

• PR title:

• PR message:

  • Added a new section for how to set up and use Milvus with Docker, and added an example of how to instantiate Milvus for hybrid retrieval
  • Fixed the documentation setup to run make lint and make format

• Add tests and docs: If you're adding a new integration, please include
  N/A

• Lint and test: Run make format, make lint and make test from the root of the package(s) you've modified. See contribution guidelines for more: https://python.langchain.com/docs/contributing/

Additional guidelines:

• Make sure optional dependencies are imported within a function.
• Please do not add dependencies to pyproject.toml files (even optional ones) unless they are required for unit tests.
• Most PRs should not touch more than one package.
• Changes should be backwards compatible.
• If you are adding something to community, do not re-import it in langchain.

If no one reviews your PR within a few days, please @-mention one of baskaryan, efriis, eyurtsev, ccurme, vbarda, hwchase17.

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[efriis]

cc @zc277584121

[markperfect]

@efriis all checks have passed

[zc277584121]

@efriis lgtm , @markperfect thank you for your great work