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

Conflicts:
- app/controllers/settings/follower_domains_controller.rb
  Removed upstream. Did the same here. Maybe we should not have?
- config/locales/en.yml
  Upstream removed the “Authorized followers” page and associated
  translations. This is too close in the file to our glitch-soc-specific
  “flavour” string. No actual conflict.
- config/locales/ja.yml
  Same as above.
- config/locales/pl.yml
  Same as above.
- config/navigation.rb
  No real conflict. New route added too close to the glitch-soc-specific
  “flavours” one.
- config/webpack/configuration.js
  Upstream refactored the webpack(er) configuration quite a bit.
  Tried to keep up.
- config/webpack/loaders/babel.js
  Upstream refactored the webpack(er) configuration quite a bit.
  Tried to keep up.
  The contents of this file have been moved to package.json.
- config/webpack/shared.js
  Upstream refactored the webpack(er) configuration quite a bit.
  Tried to keep up.
- config/webpacker.yml
  Upstream refactored the webpack(er) configuration quite a bit.
  Tried to keep up.
- jest.config.js
  The contents of this file have been moved to package.json.
- package.json
  Upstream refactored the webpack(er) configuration quite a bit.
  Tried to keep up.
- yarn.lock
  Upstream refactored the webpack(er) configuration quite a bit.
  Tried to keep up.

app/views/about/more.html.haml

@@ -8,7 +8,7 @@
   .column-0
     .public-account-header.public-account-header--no-bar
       .public-account-header__image
-        = image_tag @instance_presenter.hero&.file&.url || @instance_presenter.thumbnail&.file&.url || asset_pack_path('preview.jpg'), alt: @instance_presenter.site_title, class: 'parallax'
+        = image_tag @instance_presenter.hero&.file&.url || @instance_presenter.thumbnail&.file&.url || asset_pack_path('media/images/preview.jpg'), alt: @instance_presenter.site_title, class: 'parallax'
 
   .column-1
     .landing-page__call-to-action{ dir: 'ltr' }
@@ -24,7 +24,7 @@
             %span= t 'about.status_count_after', count: @instance_presenter.status_count
         .row__mascot
           .landing-page__mascot
-            = image_tag @instance_presenter.mascot&.file&.url || asset_pack_path('elephant_ui_plane.svg'), alt: ''
+            = image_tag @instance_presenter.mascot&.file&.url || asset_pack_path('media/images/elephant_ui_plane.svg'), alt: ''
 
   .column-2
     .landing-page__information.contact-widget

app/views/about/show.html.haml

@@ -8,7 +8,7 @@
 .landing
   .landing__brand
     = link_to root_url, class: 'brand' do
-      = image_tag asset_pack_path('logo_full.svg'), alt: 'Mastodon'
+      = image_pack_tag 'logo_full.svg', alt: 'Mastodon'
       %span.brand__tagline=t 'about.tagline'
 
   .landing__grid
@@ -48,7 +48,7 @@
 
       .hero-widget
         .hero-widget__img
-          = image_tag @instance_presenter.hero&.file&.url || @instance_presenter.thumbnail&.file&.url || asset_pack_path('preview.jpg'), alt: @instance_presenter.site_title
+          = image_tag @instance_presenter.hero&.file&.url || @instance_presenter.thumbnail&.file&.url || asset_pack_path('media/images/preview.jpg'), alt: @instance_presenter.site_title
 
         - if @instance_presenter.site_short_description.present?
           .hero-widget__text