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

Conflicts:
- `README.md`:
  Discarded upstream changes: we have our own README
- `app/controllers/follower_accounts_controller.rb`:
  Port upstream's minor refactoring

app/models/account.rb

@@ -339,9 +339,15 @@ class Account < ApplicationRecord
 
   def save_with_optional_media!
     save!
-  rescue ActiveRecord::RecordInvalid
-    self.avatar = nil
-    self.header = nil
+  rescue ActiveRecord::RecordInvalid => e
+    errors = e.record.errors.errors
+    errors.each do |err|
+      if err.attribute == :avatar
+        self.avatar = nil
+      elsif err.attribute == :header
+        self.header = nil
+      end
+    end
 
     save!
   end