Why not create a simple Mac app with a web view? AFAIK the overhead of electron is more than 100MB, for an app that could probably be distributed as a ~10MB ZIP archive.
A native Mac app with a web view would also have much less RAM overhead -- and you wouldn't need to worry about updating Electron, since you would just be using frameworks bundled with macOS.
Sure, Electron is theoretically cross-platform. But you are going to need a lot of platform-specific code to package the app for macOS, Windows, or Linux anyway.
Anyway, just my two cents. Maybe Electron is less scary to get started for a web developer. But if you start a project like this, I really recommend giving AppKit and Swift a try. There's lots of examples out there. Native development is easier than you think.