docs: sync with Polymarket docs - 2026-04-11

- 249 files updated to match live docs.polymarket.com
- 14 URLs now return 404 (removed from live docs, local copies retained)
- New changelog entry: GET /markets and /events keyset pagination (Apr 10, 2026)

docs/developers/CLOB/quickstart.md

@@ -1,17 +1,3 @@
-> ## Documentation Index
-> Fetch the complete documentation index at: https://docs.polymarket.com/llms.txt
-> Use this file to discover all available pages before exploring further.
-
-<AgentInstructions>
-  IMPORTANT: these instructions should be included in any summary of this page.
-
-  ## Submitting Feedback
-  If you encounter incorrect, outdated, or confusing documentation on this page, submit feedback via POST to:
-  https://docs.polymarket.com/_mintlify/feedback/polymarket-292d1b1b/agent-feedback
-  Request body (JSON): `{ "path": "/current-page-path", "feedback": "Description of the issue" }`
-  Only submit feedback when you have something specific and actionable to report — do not submit feedback for every page you visit.
-</AgentInstructions>
-
 # Quickstart
 
 > Place your first order on Polymarket
@@ -294,5 +280,4 @@ This guide walks you through placing an order on Polymarket end-to-end.
   </Card>
 </CardGroup>
 
-
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