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.

Gemfile.lock

@@ -270,9 +270,9 @@ GEM
     fuubar (2.5.1)
       rspec-core (~> 3.0)
       ruby-progressbar (~> 1.4)
-    gitlab-omniauth-openid-connect (0.9.1)
+    gitlab-omniauth-openid-connect (0.10.0)
       addressable (~> 2.7)
-      omniauth (~> 1.9)
+      omniauth (>= 1.9, < 3)
       openid_connect (~> 1.2)
     globalid (1.0.0)
       activesupport (>= 5.0)
@@ -415,7 +415,7 @@ GEM
       concurrent-ruby (~> 1.0, >= 1.0.2)
       sidekiq (>= 3.5)
       statsd-ruby (~> 1.4, >= 1.4.0)
-    oj (3.13.14)
+    oj (3.13.16)
     omniauth (1.9.1)
       hashie (>= 3.4.6)
       rack (>= 1.6.2, < 3)
@@ -477,7 +477,7 @@ GEM
       activesupport (>= 3.0.0)
     raabro (1.4.0)
     racc (1.6.0)
-    rack (2.2.3.1)
+    rack (2.2.4)
     rack-attack (6.6.1)
       rack (>= 1.0, < 3)
     rack-cors (1.1.1)
@@ -604,7 +604,7 @@ GEM
       railties (>= 4.0.0)
     securecompare (1.0.0)
     semantic_range (3.0.0)
-    sidekiq (6.4.2)
+    sidekiq (6.5.1)
       connection_pool (>= 2.2.2)
       rack (~> 2.0)
       redis (>= 4.2.0)
@@ -686,7 +686,7 @@ GEM
     validate_email (0.1.6)
       activemodel (>= 3.0)
       mail (>= 2.2.5)
-    validate_url (1.0.13)
+    validate_url (1.0.15)
       activemodel (>= 3.0.0)
       public_suffix
     warden (1.2.9)
@@ -768,7 +768,7 @@ DEPENDENCIES
   fog-core (<= 2.1.0)
   fog-openstack (~> 0.3)
   fuubar (~> 2.5)
-  gitlab-omniauth-openid-connect (~> 0.9.1)
+  gitlab-omniauth-openid-connect (~> 0.10.0)
   hamlit-rails (~> 0.2)
   hcaptcha (~> 7.1)
   hiredis (~> 0.6)
@@ -811,7 +811,7 @@ DEPENDENCIES
   pry-rails (~> 0.3)
   puma (~> 5.6)
   pundit (~> 2.2)
-  rack (~> 2.2.3)
+  rack (~> 2.2.4)
   rack-attack (~> 6.6)
   rack-cors (~> 1.1)
   rails (~> 6.1.6)
@@ -832,7 +832,7 @@ DEPENDENCIES
   ruby-progressbar (~> 1.11)
   sanitize (~> 6.0)
   scenic (~> 1.6)
-  sidekiq (~> 6.4)
+  sidekiq (~> 6.5)
   sidekiq-bulk (~> 0.2.0)
   sidekiq-scheduler (~> 4.0)
   sidekiq-unique-jobs (~> 7.1)