docs: Add keywords and descriptions for every page, rewrote llms.txt, added another redirect (#5461)

docs/sdk-reference/complete-reference.mdx

@@ -1,7 +1,21 @@
 ---
 title: Complete Reference (For LLMs)
 subtitle: Every method, parameter, and type in one page
+description: Complete reference for every method, parameter, and type in the Skyvern Python SDK. Includes tasks, workflows, browser sessions, browser profiles, credentials, helper methods, browser control, and error handling in a single page.
 slug: sdk-reference/complete-reference
+keywords:
+  - complete reference
+  - all methods
+  - run_task
+  - run_workflow
+  - browser automation
+  - Playwright
+  - launch_cloud_browser
+  - page.act
+  - page.extract
+  - page.agent
+  - credential
+  - error handling
 ---
 
 ## Install and initialize