Update README.md to reflect recent changes

- Emoji picker in composer is no longer a blob cat, or an emoji to begin with. So remove that point, lol.
- Update upstream image size limit (still lower than ours)
- We modified Oatstodon slightly to fix the appearance of profile fields.
- We have applied the mastodon-sakura filtering patch to our fork.

README.md

@@ -21,15 +21,15 @@ instead, use merge (fast-forward, if possible, with merge commit otherwise).
   - sounds/boop.mp3
   - sounds/boop.ogg
     <br>You might want to revert these to the upstream files (or your own versions!) if you decide to use this fork for your own instance.
-- The web frontend emoji picker is a blobcat instead of the joy emoji.
 - The rate limits for authenticated users have been relaxed a bit.
 - The API endpoint `/api/v1/custom_emojis` is no longer affected by AUTHORIZED_FETCH, allowing anyone to copy custom emojis.
-- Allow higher resolution images. (4096x4096 instead of the previous limit of 1920x1080)
+- Allow higher resolution images. (4096x4096 instead of the previous limit of 3840x2160)
 - Allow posting polls with only one poll option (if `MIN_POLL_OPTIONS` is set to 1 on your instance).
-- Added oatstodon flavour (taken from [types.pl fork](https://github.com/ralsei/types.pl), by [@oat@hellsite.site](https://hellsite.site/@oat))
+- Added oatstodon flavour (taken from [types.pl fork](https://github.com/ralsei/types.pl), by [@oat@hellsite.site](https://hellsite.site/@oat)), with slight adjustments since.
 - Emoji reactions on statuses (with both Unicode and custom emojis, same as for announcements), a feature originally developed for [Nyastodon](https://git.bsd.gay/fef/nyastodon).
   Ended up as a Catstodon-maintained patch after its initial two Pull Requests to glitch-soc, but was handed over to [Essem's fork, Chuckya](https://github.com/TheEssem/mastodon) and is now pending [its fourth attempt of merging into glitch-soc](https://github.com/glitch-soc/mastodon/pull/2462).
 - Lifts the "only federate local favourites" restriction on favourites/likes and emoji reactions.
+- Cherry-picks the [activity filter branch](https://github.com/chikorita157/mastodon-sakura/tree/newmain-tmp3-noellabo-filtering) from [Sakurajima Mastodon](https://github.com/chikorita157/mastodon-sakura).
 
 ## Previous differences now merged into glitch-soc