Merge branch 'alexgleason-develop-patch-78175' into 'develop'

Restore 404.html

See merge request soapbox-pub/soapbox!2675

.gitlab-ci.yml

@@ -105,6 +105,7 @@ build-production:
     # # Fail if files got changed.
     # # https://stackoverflow.com/a/9066385
     # - git diff --quiet
+    - cp static/index.html static/404.html
   variables:
     NODE_ENV: production
   artifacts: