Thank you for all your kind words.
There is a public repository for the DHX docs:
If you need some specific state of the docs you can go to commits section:
search for commit related to the needed build (in your case it is 7.3.1.4 - latest build before the 8.0) and fetch its code:
To start the docs locally you should call
yarn
yarn start
(worked well for me with the node.js 16)
Though, the solution suggested by @ND_Results is recommended and more stable, I suppose, as older states of the documentation may contain typos or mistakes in the articles, which were fixed in the later versions