I currently have my blog hosted on Github Pages and am using custom domains of the type mydomain.toplevel and www.mydomain.toplevel.
How can I set up a sub-subdomain of the type two.words.mydomain.toplevel and www.two.words.mydomain.toplevel and point them to a specific directory?
I've found enough information on how to set up a single subdomain, but none of what I found seems to carry over to sub-subdomains in a straightforward way.
I appreciate any pointers. Please note I still want to be able to reach my blog at its current URL. I'm not very experienced with this stuff and I set up my current URL using the Github.com graphical interface, which doesn't include any options for subdomains (let alone sub-subdomains).