I have had a great doubt for a long time, and I have been able to observe in some manufacturers that chips and tutorials, such as espressif or microchip technology, use pages with this format in some of their tutorials:
I would like to know if this page format is some standard or is it just a popular template that is often used or generated with some framework?
It would be interesting to be able to implement some identical format, I hope you can help me.
This is made using a document generator, and there are lots of them out there.
The specific one in your image example seem to be Read the docs.
You can look up "documentation generator" or "static documentation generator" for more examples.