Add testing jf web page

docs/general/testing/web/index.md

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+---
+uid: testing-web
+title: Testing Jellyfin Web
+---
+
+## Weekly Unstable Builds
+
+Weekly unstable builds ship server and web in a complete package. Please refer to [Testing Jellyfin Server](/docs/general/testing/server/) for more info.
+
+## Testing PRs from Cloudflare Pages Deployments
+
+Each PR of Jellyfin Web is automatically deployed to Cloudflare Pages. Please follow the steps below on how to test them.
+
+1. Find the PR you would like to checkout in [the list of open PRs](https://github.com/jellyfin/jellyfin-web/pulls).
+2. There should be a comment from `jellyfin-bot` with a link to a deployed version of this PR.
+   ![CF Pages Comment](/images/docs/testing/web/cf-pages-comment)
+3. Clicking on the link in the comment will open an instance of Jellyfin Web that is linked to a development instance of a Jellyfin demo server. You can login to the demo server with the credentials provided on the login page, or login to a different server by clicking `Change Server`.
+