A page per connector in the catalog: start without code, how it works, every tool - #1554

Adds docs/catalog/connectors/<slug>.md for each of the 704 Cloud connectors, linked from the category pages.

Each page has:

• Start without code: a button that opens sign-up on AnythingMCP Cloud and then the connector, ready to install. The link carries utm_source=github&utm_medium=catalog&utm_campaign=<slug>, so the sign-up is attributed. Then five steps that need no terminal, with links to the setup guide in each of the 7 locales and the guide for each assistant.
• How it works: a Mermaid diagram of the request path (client → AnythingMCP → the system's API, with host and auth type), plus who sees what.
• Tools and a Tool reference from the adapter JSON: each tool, whether it reads or writes, the call it makes and every parameter with type, required flag and description.
• Run it yourself: Docker and the variables to enter.

The pages are generated by scripts/export-github-catalog.mjs in the website repository. They link to the guides on anythingmcp.com and never copy them.

llms.txt leaves the folder out through the new EXCLUDED_DOC_DIRS, because the category pages it lists already link to every page; the docs coverage test knows about it.

Checks:

• all 3,510 relative links resolve;
• a sample of 40 of the 9,045 anythingmcp.com links answered HTTP 200;
• the largest page (Atlassian) is 185 KB;
• generate-llms-txt tests pass (15/15).