Simple static site generator in python
This is the simplest option. Commit the dist directory with generated html files and assets to your github repository. Next create a DigitalOcean App Platform "App", and point it to your github repository. Configure it to find the files in the dist directory.
This gives you more control over both the server environment as well as the deployment pipeline, but it is more involved. You'd include two files in your repository: a Dockerfile specifying the server, and a DigitalOcean App specification in yaml. In the deployment pipeline you then build the docker container and push it to a central registry. In the app specification you'd list the container registry address, and using the commandline tool doctl you tell DigitalOcean to schedule a deployment from the new container.