Add new Polymarket documentation (2026-02-17)

- Added 31 new documentation pages from llms.txt index
- Updated changelog and 4 existing pages
- New categories: polymarket-learn (FAQ, deposits, get-started, markets, trading)
- New API: get-positions-for-a-market
- New guide: builders examples

docs/polymarket-learn/FAQ/embeds.md

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+> ## 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.
+
+# How To Use Embeds
+
+> Adding market embeds to your Substack or website.
+
+Polymarket allows you to embed a live-updating widget displaying the latest odds for markets in many places around the web.
+
+### Web
+
+Navigate to the individual market you want to embed and click the embed (\< >) link.
+
+Select light or dark mode, and copy the auto-generated code
+Paste the code into your code editor or CMS and publish as normal
+
+### Twitter / X
+
+Navigate to any Polymarket market
+Copy the URL from your browser
+Paste the URL into the compose window
+
+### Substack
+
+<Note>The embeds feature currently supports single markets only (eg “USA to Win Most Gold Medals”, not “Most Gold Medals at Paris Olympics’) </Note>
+
+To embed a market, navigate on Polymarket.com to the single market you want to embed and click “copy link.”
+
+Navigate to your Substack editor and paste the link directly into the body of your newsletter. The editor will recognize the market and convert it to a widget that automatically refreshes with the latest odds.
+
+### Ticker
+
+The Polymarket Live Ticker displays real-time prediction market data for your livestream or website. Navigate to [https://ticker.polymarket.com/](https://ticker.polymarket.com/) to create a custom ticker by category (Breaking News, Politics, etc.) and copy the embed code to add it to your site.