[Github Pages] "Excluding" a subpage from CNAME?

Hello!

I’ve recently claimed my namecheap domain name from the Gh education pack, and my site is up and running @ http://www.johnalcher.me

Unfortunately, the SSL certificate would be going to waste since Github Pages doesn’t support SSL installations. That spells disaster for my projects that rely on external APIs. See my weather app.

Would it be possible to host the weather app on the vanilla github pages domain? To be exact, I want to prevent https://alchermd.github.io/weather-app to redirect to https://www.johnalcher.me/weather-app because I need the HTTPS provided by GH-pages.

Any help would be appreciated! Thanks <3