docs: update pipedream docs

[daveomri]

Updates the Pipedream integration doc to match the connector changes from the retest, plus some housekeeping.

What changed

• Copy: removed the deleted Run Task Synchronously action; updated Run Actor params (schema-driven input, Memory dropdown, Build accepts tag or number, Wait for Finish switch); Get Dataset Items now notes ID or name.
• Screenshots: refreshed the Run Actor screenshot and converted all images to WebP (dropped the PNGs).
• Logo + hub cards: added the official Pipedream SVG logo and a Pipedream card to both integration hubs (it was previously missing from the hubs; the old PNG logo was unreferenced).
• AI usage: added a note pointing to the Apify MCP server for AI agents, and a caution that Pipedream's AI builder is token-heavy for this schema-driven connector.

Note

** Merge this alongside the connector release**, not before.