docs(mongodb): add docs for MongoDB Atlas connection

[burmecia]

What kind of change does this PR introduce?

This PR is to add docs for MongoDB Atlas (https://cloud.mongodb.com/) connection:

• connection string example for MongoDB Atlas
• IP access list setup on MongoDB Atlas
• docs index link

What is the current behavior?

N/A

What is the new behavior?

N/A

Additional context

N/A

[Copilot]

Pull request overview

Adds documentation updates to better support connecting the MongoDB wrapper to MongoDB Atlas, and wires the MongoDB docs into the docs navigation/catalog.

Changes:

• Add MongoDB to the MkDocs “Catalog” navigation.
• Add an Atlas-oriented mongodb+srv:// connection string example plus an IP Access List warning in the MongoDB docs.
• Add MongoDB to the catalog index table.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
mkdocs.yaml	Adds MongoDB docs page to the Catalog navigation.
docs/catalog/mongodb.md	Adds Atlas connection string example and Atlas IP Access List guidance; notes Atlas egress-IP limitation.
docs/catalog/index.md	Adds MongoDB to the official integrations table.

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