Merge branch 'main' into glitch-soc/merge-upstream

- `.env.production.sample`:
  Our sample config file is very different from upstream since it is much more
  complete. Upstream added documentation for a few env variables.
  Copied the new variables/documentation from upstream.
- `app/lib/feed_manager.rb`:
  Upstream added a timeline type (hashtags), while glitch-soc already had an
  extra one (direct messages). Not really a conflict but textually close
  changes.
  Ported upstream's changes.
- `app/models/custom_emoji.rb`:
  Upstream upped the custom emoji size limit, while glitch-soc had configurable
  limits.
  Upped the default limits accordingly.
- `streaming/index.js`:
  Upstream reworked how hastags were normalized. Minor conflict due to
  glitch-soc's handling of instance-local posts.
  Ported upstream's changes.

app/workers/feed_insert_worker.rb

@@ -9,7 +9,7 @@ class FeedInsertWorker
     @options   = options.symbolize_keys
 
     case @type
-    when :home
+    when :home, :tags
       @follower = Account.find(id)
     when :list
       @list     = List.find(id)
@@ -38,6 +38,8 @@ class FeedInsertWorker
     case @type
     when :home
       FeedManager.instance.filter?(:home, @status, @follower)
+    when :tags
+      FeedManager.instance.filter?(:tags, @status, @follower)
     when :list
       FeedManager.instance.filter?(:list, @status, @list)
     when :direct
@@ -53,7 +55,7 @@ class FeedInsertWorker
 
   def perform_push
     case @type
-    when :home
+    when :home, :tags
       FeedManager.instance.push_to_home(@follower, @status, update: update?)
     when :list
       FeedManager.instance.push_to_list(@list, @status, update: update?)
@@ -64,7 +66,7 @@ class FeedInsertWorker
 
   def perform_unpush
     case @type
-    when :home
+    when :home, :tags
       FeedManager.instance.unpush_from_home(@follower, @status, update: true)
     when :list
       FeedManager.instance.unpush_from_list(@list, @status, update: true)