rm: projects docs (#22445)

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## Description

Removes project docs. 
They have been archived into the team's google drive

## Related issues or tickets

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## Reviews

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- [ ] Technical review
- [ ] Editorial review
- [ ] Product review

Author: aevesdocker

content/manuals/_index.md

@@ -59,10 +59,6 @@ params:
     description: Run integration tests, with real dependencies, in the cloud.
     icon: package_2
     link: https://testcontainers.com/cloud/docs/
-  - title: Docker Projects
-    description: Use a unified, project-based workflow to run your containerized projects. 
-    icon: folder
-    link: /projects/
   platform:
   - title: Administration
     description: Centralized observability for companies and organizations.