- Switched to CMake for configuring and building the doxygen Website.
- Set the minimum requirements to CMake >=3.18.4 and Doxygen >=1.9.1.
- Rewrite the LICENSE.txt and docs README.txt to markdown.
- Add the folder which is used in the README to gitignore.
- Add a custom style to the doxygen website based on the docs webpage.
- Update CI to use the new Doxygen Build process.
Closes#7052
