Help regarding a secure section on Static-Site.

I had built a simple hugo blog for my mother, and hosted it with a Forestry.io + Github + Netlify combo. Forestry provided a nice wysiwyg editor to write her blogs, and netlify hooks would generate static site and update the site.

Now that forestry is gone, I am looking a way to integrate some way of having a secure page where I can self host a cms like setup. How do I do it, in Static-site? There is no backend server for it.