docs: add activepieces documentation

[jsimecek]

Add documentation for the Activepieces integration along with example images.

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Note

Adds a new docs page platform/integrations/workflows-and-notifications/activepieces.md describing how to integrate Apify with Activepieces.

• Covers connection setup with API key, creating flows, and configuring Apify triggers (Actor/Task runs)
• Details actions (Run Actor/Task, Get Dataset Items, Get Key-Value Store Record, Scrape Single URL) and wait-for-finish behavior
• Notes automatic webhook management for triggers and includes troubleshooting tips
• Includes illustrative screenshots referenced under ../images/activepieces/

^{Written by Cursor Bugbot for commit 456167d. Configure here.}

[marcel-rbro]

Looks good now 👍