Documentation Overhaul

We've completely rewritten all documentation to reflect the current state of the API.

What's new

Runs documentation — Full documentation for the Runs resource and multi-step workflows
Connections documentation — How to link your own S3-compatible storage
Events documentation — Queryable lifecycle events for tasks and runs
Webhook Endpoints documentation — The new subscription-based webhook system
Summary task documentation — Replaces the old Description task docs

Tasks — Updated with correct statuses, nested options format, and all current task kinds
Automations — Simplified without triggers, HTTP-only invocation
Workflows — Updated conditions syntax and options nesting
All guides — Rewritten to use the current API format
API Reference — New pages for Runs, Connections, Webhooks, Events, and Keys
Pagination — Updated to document cursor-based pagination
Error codes — Updated with structured error format including kind field