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

Conflicts:
- `app/controllers/accounts_controller.rb`:
  Upstream change too close to a glitch-soc change related to
  instance-local toots. Merged upstream changes.
- `app/services/fan_out_on_write_service.rb`:
  Minor conflict due to glitch-soc's handling of Direct Messages,
  merged upstream changes.
- `yarn.lock`:
  Not really a conflict, caused by glitch-soc-only dependencies
  being textually too close to updated upstream dependencies.
  Merged upstream changes.

db/migrate/20200630190240_create_webauthn_credentials.rb

@@ -0,0 +1,16 @@
+class CreateWebauthnCredentials < ActiveRecord::Migration[5.2]
+  def change
+    create_table :webauthn_credentials do |t|
+      t.string :external_id, null: false
+      t.string :public_key, null: false
+      t.string :nickname, null: false
+      t.bigint :sign_count, null: false, default: 0
+
+      t.index :external_id, unique: true
+
+      t.references :user, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20200630190544_add_webauthn_id_to_users.rb

@@ -0,0 +1,5 @@
+class AddWebauthnIdToUsers < ActiveRecord::Migration[5.2]
+  def change
+    add_column :users, :webauthn_id, :string
+  end
+end