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.

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2022_07_04_024901) do
+ActiveRecord::Schema.define(version: 2022_07_14_171049) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -931,6 +931,15 @@ ActiveRecord::Schema.define(version: 2022_07_04_024901) do
     t.datetime "updated_at", null: false
   end
 
+  create_table "tag_follows", force: :cascade do |t|
+    t.bigint "tag_id", null: false
+    t.bigint "account_id", null: false
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["account_id", "tag_id"], name: "index_tag_follows_on_account_id_and_tag_id", unique: true
+    t.index ["tag_id"], name: "index_tag_follows_on_tag_id"
+  end
+
   create_table "tags", force: :cascade do |t|
     t.string "name", default: "", null: false
     t.datetime "created_at", null: false
@@ -943,6 +952,7 @@ ActiveRecord::Schema.define(version: 2022_07_04_024901) do
     t.datetime "last_status_at"
     t.float "max_score"
     t.datetime "max_score_at"
+    t.string "display_name"
     t.index "lower((name)::text) text_pattern_ops", name: "index_tags_on_name_lower_btree", unique: true
   end
 
@@ -1169,6 +1179,8 @@ ActiveRecord::Schema.define(version: 2022_07_04_024901) do
   add_foreign_key "statuses", "statuses", column: "reblog_of_id", on_delete: :cascade
   add_foreign_key "statuses_tags", "statuses", on_delete: :cascade
   add_foreign_key "statuses_tags", "tags", name: "fk_3081861e21", on_delete: :cascade
+  add_foreign_key "tag_follows", "accounts", on_delete: :cascade
+  add_foreign_key "tag_follows", "tags", on_delete: :cascade
   add_foreign_key "tombstones", "accounts", on_delete: :cascade
   add_foreign_key "user_invite_requests", "users", on_delete: :cascade
   add_foreign_key "users", "accounts", name: "fk_50500f500d", on_delete: :cascade