Enjoy editing Codemirror files with Codemirror on the forge, please!

PS: In case you want to improve how it is used within Forgejo, feel free to propose changes to the concerning files in https://codeberg.org/forgejo/forgejo/src/branch/forgejo/web_src/js/features or report issues at https://codeberg.org/forgejo/forgejo/issues. Thanks in advance!

~ @Robert Wolff