Improve generator.html

[kalwalt]

Do you want to request a feature or report a bug?
The marker generator need an update, It generate a pattern marker but i think some libraries can be upgraded.

What is the current behavior?
It correctly generate a pattern marker but as explained above we should/could improve a bit. Maybe @nickw1 we could host somewhere on https://github.com/AR-js-org/AR-js-org.github.io?

If the current behavior is a bug, please provide the steps to reproduce.
No bugs, skip this.

Please mention other relevant information such as the browser version, Operating System and Device Name
Tested on Chrome 131.0.6778.140 (64 bit) Windows 11.
What is the expected behavior?
It correctly generate a pattern marker, see my comment above.
If this is a feature request, what is motivation or use case for changing the behavior?
The motivation, if we can, is to improve the generator app.

[nickw1]

@kalwalt yes, hosting on github.io would make sense as it's client-side code.