[docs]: Update FAQ and ROADMAP (#2458)

* Update faq.md

* Update ROADMAP.md

* Add PR links

ROADMAP.md

@@ -51,8 +51,8 @@ What follows is a rough timeline of features that will be implemented on the roa
 
 ### Mid/late 2023
 
-- [ ] **Polls** -- implementing parsing, creating, and voting in polls.
-- [ ] **Mute posts/threads** -- opt-out of notifications for replies to a thread; no longer show a given post in your timeline.
+- [x] **Polls** -- implementing parsing, creating, and voting in polls. (Done! https://github.com/superseriousbusiness/gotosocial/pull/2330)
+- [x] **Mute posts/threads** -- opt-out of notifications for replies to a thread; no longer show a given post in your timeline. (Done! https://github.com/superseriousbusiness/gotosocial/pull/2278)
 - [x] **Limited peering/allowlists** -- allow instance admins to limit federation with other instances by default. (Done! https://github.com/superseriousbusiness/gotosocial/pull/2200)
 
 ### Late 2023

docs/faq.md

@@ -40,10 +40,8 @@ Right now the only way to create an account is by the server's admin to run a co
 
 Take a look at the [list of open bugs](https://github.com/superseriousbusiness/gotosocial/issues?q=is%3Aissue+is%3Aopen+label%3Abug) and the [roadmap](https://github.com/superseriousbusiness/gotosocial/blob/main/ROADMAP.md) for a more detailed rundown, but the main missing features at the time of this writing are:
 
-- muting conversations
 - backfill of posts
 - web-based signup
-- polls
 - scheduling posts
 - account migration
 - shared block lists across servers