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

Conflicts:
- `app/javascript/styles/fonts/montserrat.scss`:
  Code style changes upstream, path changes in glitch-soc.
  Applied upstream's code style changes.
- `app/javascript/styles/fonts/roboto-mono.scss`:
  Code style changes upstream, path changes in glitch-soc.
  Applied upstream's code style changes.
- `app/javascript/styles/fonts/roboto.scss`:
  Code style changes upstream, path changes in glitch-soc.
  Applied upstream's code style changes.
- `app/models/account.rb`:
  Textual conflict only caused by glitch-soc using a different value
  for character limits in a nearby line.
  Applied upstream's changes.
- `app/views/statuses/_simple_status.html.haml`:
  Attribute added to a tag modified by glitch-soc.
  Added upstream's attributes.
- `yarn.lock`:
  Upstream added/updated dependencies close to glitch-soc-only ones.
  Updated/added upstream dependencies.

app/models/custom_emoji.rb

@@ -32,7 +32,7 @@ class CustomEmoji < ApplicationRecord
     :(#{SHORTCODE_RE_FRAGMENT}):
     (?=[^[:alnum:]:]|$)/x
 
-  IMAGE_MIME_TYPES = %w(image/png image/gif).freeze
+  IMAGE_MIME_TYPES = %w(image/png image/gif image/webp).freeze
 
   belongs_to :category, class_name: 'CustomEmojiCategory', optional: true
   has_one :local_counterpart, -> { where(domain: nil) }, class_name: 'CustomEmoji', primary_key: :shortcode, foreign_key: :shortcode