A lot of the auxiliary project documentation was pretty old, redundant, or could use some polishing. This change fixes up some wording, grammar, layout and generally cleans up the docs a bit. It's not perfection, but it's an improvement
I also tried to streamline and beautify the top-level `README.md` to be more appealing, clear, and to direct people to the official docs. To this end, I moved the building instructions to This is based on what I've seen in some other popular github projects.
- Upgraded doxyfile to latest format
- Fixed a bunch of warnings and errors in docstrings that doxygen was complaining about
- Added the doxygen-awesome theme to modernize the output
- Removed a duplicate screenshot we'd had in the docs folder
- Moved the RecastDemo screenshot into the Docs/images folder
- Changed the doxygen main page to be the README.md since the dedicated main page file we had was nearly identical but out of date
- Added CONTRIBUTING.md so it's part of the generated doxygen output
- Removed duplicate license file to avoid confusion
- Combined the FAQ with the Recast_api.txt, since the FAQ was essentially just better docs for the members of `rcConfig`
Updates the content of the documentation home page to match the content
of the GitHub repository home page. This includes the new Recast
introduction image, premake4 based build info, etc.
