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

Conflicts:
- `README.md`:
  Upstream README has been changed, but we have a completely different one.
  Kept our `README.md`.
- `lib/sanitize_ext/sanitize_config.rb`:
  Upstream added support for more incoming HTML tags (a large subset of what
  glitch-soc accepts).
  Change the code style to match upstream's but otherwise do not change our
  code.
- `spec/lib/sanitize_config_spec.rb`:
  Upstream added support for more incoming HTML tags (a large subset of what
  glitch-soc accepts).
  Kept our version, since the tests are mostly glitch-soc's, except for cases
  which are purposefuly different.

app/validators/ed25519_key_validator.rb

@@ -6,7 +6,7 @@ class Ed25519KeyValidator < ActiveModel::EachValidator
 
     key = Base64.decode64(value)
 
-    record.errors[attribute] << I18n.t('crypto.errors.invalid_key') unless verified?(key)
+    record.errors.add(attribute, I18n.t('crypto.errors.invalid_key')) unless verified?(key)
   end
 
   private

app/validators/ed25519_signature_validator.rb

@@ -8,7 +8,7 @@ class Ed25519SignatureValidator < ActiveModel::EachValidator
     signature  = Base64.decode64(value)
     message    = option_to_value(record, :message)
 
-    record.errors[attribute] << I18n.t('crypto.errors.invalid_signature') unless verified?(verify_key, signature, message)
+    record.errors.add(attribute, I18n.t('crypto.errors.invalid_signature')) unless verified?(verify_key, signature, message)
   end
 
   private