Purpose of the change

Creation of a new docs.memmachine.ai page dedicated to CrewAI integration with MemMachine.

Description

1. Updated docs.json to include new page.
2. Created new page for our CrewAI Integration, provided information from README file, tweaked to fit style of site.
3. Updated our /docs/install_guide/introduction.mdx page to add a new card for CrewAI.

Fixes/Closes

Fixes #879

Type of change

• New feature (non-breaking change which adds functionality)
• Documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

• Manual verification (list step-by-step instructions)

mint broken-links comes back with no broken links found.
Please see Test results for image screen shots of new page.
Test Results:
Introduction page showing new card, and menu on left-hand side showing new link in Integrations section:

New CrewAI page (image 1):

New CrewAI page (image 2):

New CrewAI page (image 3):

New CrewAI page (image 4):

New CrewAI page (image 5):

New CrewAI page (image 6):

New CrewAI page (image 7):

Checklist

[Please delete options that are not relevant.]

• I have signed the commit(s) within this pull request
• My code follows the style guidelines of this project (See STYLE_GUIDE.md)
• [ X I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

Maintainer Checklist

• Confirmed all checks passed
• Contributor has signed the commit(s)
• Reviewed the code
• Run, Tested, and Verified the change(s) work as expected

Screenshots/Gifs

See Test Results section

Further comments

This PR should not be approved and merged until after PR#875, which holds the actual CrewAI integration.