I have a similar setup for my blog and I'm using Netlify for both CI and hosting (free). It's been great! GitHub Actions could probably work well for you if you already have decent hosting.
Of course I'm not sure what other people are using them for, but in my case GitLab/GitHub covered all my bases pretty well since I wasn't looking for a pelican/hugo CMS and you still host somewhere else (not Netlify).
Netlify's main business is.
Netlify also provides deployment previews for commits and PRs, and a complete CI/CD pipeline that you would have to implement yourself with Github Actions or something else.
The CMS isn't what I need either, but there is so much more than just hosting.
They can also manage your domain/ssl which is nice so I can manage everything related to my site on Netlify.
Lmk if you need any extra details
When you feel you want more, you can link a git repo and point a domain name at it. When you update the repo, it automagically updates the site.
It's my goto for all new projects.
There is great documentation at every step.