I want to add/link boostrap CDN to my concrete5 (v. 5.6) block. I want it to be specific to this particular block only. I tried to search in the old documentation at
https://legacy-documentation.concrete5.org/developers
but couldn't find anything. I found something in new documentation using assets
https://www.concrete5.org/community/forums/5-7-discussion/how-exactly-do-we-use-asset-registering
but this doesn't seem to work in old version.
Thank You