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

Conflicts:
- `.github/dependabot.yml`:
  Updated upstream, we deleted it to not be flooded by Depandabot.
  Kept deleted.
- `Gemfile.lock`:
  Puma updated on both sides, went for the most recent version.
- `app/controllers/api/v1/mutes_controller.rb`:
  Upstream updated the serializer to support timed mutes, while
  glitch-soc added a custom API ages ago to get information that
  is already available elsewhere.
  Dropped the glitch-soc-specific API, went with upstream changes.
- `app/javascript/core/admin.js`:
  Conflict due to changing how assets are loaded. Went with upstream.
- `app/javascript/packs/public.js`:
  Conflict due to changing how assets are loaded. Went with upstream.
- `app/models/mute.rb`:
  🤷
- `app/models/user.rb`:
  New user setting added upstream while we have glitch-soc-specific
  user settings. Added upstream's user setting.
- `config/settings.yml`:
  Upstream added a new user setting close to a user setting we had
  changed the defaults for. Added the new upstream setting.
- `package.json`:
  Upstream dependency updated “too close” to a glitch-soc-specific
  dependency. No real conflict. Updated the dependency.

db/migrate/20200317021758_add_expires_at_to_mutes.rb

@@ -0,0 +1,5 @@
+class AddExpiresAtToMutes < ActiveRecord::Migration[5.2]
+  def change
+    add_column :mutes, :expires_at, :datetime
+  end
+end

db/migrate/20201008202037_create_ip_blocks.rb

@@ -0,0 +1,12 @@
+class CreateIpBlocks < ActiveRecord::Migration[5.2]
+  def change
+    create_table :ip_blocks do |t|
+      t.inet :ip, null: false, default: '0.0.0.0'
+      t.integer :severity, null: false, default: 0
+      t.datetime :expires_at
+      t.text :comment, null: false, default: ''
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20201008220312_add_sign_up_ip_to_users.rb

@@ -0,0 +1,5 @@
+class AddSignUpIpToUsers < ActiveRecord::Migration[5.2]
+  def change
+    add_column :users, :sign_up_ip, :inet
+  end
+end