Project Onepage is attempt to compile complex client web applications/sites into single HTML file.
It's difficult to always search an index.html file in doc folder. And if you want to copy, move or archivate your project - it may take a lot of time with many files. But with Onepage tool you may replace it with one html file which contains: html pages, css styles, images and scripts.
You may use it to simplify you html-doxygen.
$ python onepage.py examples/example2 out.html
Result: out.html