fix: crowd.dev integration docs removal

[gaspergrom]

Summary

Since crowd.dev has been aquired by the LFX the platform is no longer available for the general public, thats why i removed the crowd.dev node from your integrations.

Related Linear tickets, Github issues, and Community forum posts

Issue in the main (n8n) repository: n8n-io/n8n#17613

Changes

Removal of documentation related to crowd.dev integration.

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[imchairmanm]

Thanks @gaspergrom! We'll hold off on reviewing this until the PR is ready to go in the main repo.