1. The demo is referred from https://github.com/jgraph/drawio-github
2. Open or create the drawio in https://app.diagrams.net/?mode=github
3. For the first time to use, may need to add the application from github app.
4. Select the repo and where the folder to store.
5. New draw with the first commit.
6. Save the draw will make an new commit.
7. Save as png or svg for embeded as image
8. Complete

reference: https://github.com/jgraph/drawio-github