GitHub offers hosting documentation on GitHub Pages. This can be done once for each GitHub user, for each GitHub organization, for each GitHub project.
If the process for building the autodocs is already in place (as is the case for libyui), it is just a matter of generating them, moving them to the right place, and deploying them to the project's GitHub Pages.
CentOS 7 distribution (as well as RHEL 7) ships with a somewhat outdated version of the GCC compiler (4.8.5 on CentOS 7.5), which may not be suitable to your compilation requirements. For example, C11 - which supersedes C99 - is fully supported only starting from GCC 4.9).
Additionally, recent versions of GCC (GCC6, GCC7, GCC8, GCC9) come with improvements which help detect issues at build time and offer suggestions on how to fix them. Sometimes, these are even actually helpful!
This note describes how to build the latest GCC (9.2.0 as of October 2019) from sources on CentOS 7. This should be applicable as is on RHEL 7. For other Linux distributions, adapt as needed.