Documentation

[RippeR37]

Write/improve documentation.

• Decide on and setup documentation framework
• Hook it to CMake for local builds (on-demand)
• Hook it to CI (GitHub Actions) for continuous building and deployment
• Add versioning system for documentation (branches, tags, etc.)
• Add custom/manual documentation content
• (Optional) Add in-source documentation to be picked-up by Doxygen

[RippeR37]

Basic documentation system added, along with the CI integration for building documentation for all branches/tags.

[RippeR37]

Documentation added. There will be many improvements (e.g. all code examples will be sourced from the actual examples built on CI, or add in-source documentation to be picked-up by the doxygen) but they will target later releases.