docs: Update tracking issue link to discussion in README (#57793)

Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Release Notes:

- N/A

README.md

@@ -13,7 +13,7 @@ On macOS, Linux, and Windows you can [download Zed directly](https://zed.dev/dow
 
 Other platforms are not yet available:
 
-- Web ([tracking issue](https://github.com/zed-industries/zed/issues/5396))
+- Web ([tracking discussion](https://github.com/zed-industries/zed/discussions/26195))
 
 ### Developing Zed