This commit updates SLAM module documentation files to include direct code links for better navigation. It also adjusts imports in `test_iterative_closest_point.py` to reflect updated module structure and adds a safety check for the directory in `runtests.sh`.
Updated all instances of "Ref:" to "Reference" for consistency in both code and documentation. This change improves clarity and aligns with standard terminology practices.
* fix: correct terminology in documentation and update Sphinx options
* fix: correct terminology in documentation and update Sphinx options
* fix: correct terminology in documentation and update Sphinx options
* fix: correct terminology in documentation and update Sphinx options
* fix: correct terminology in documentation and update Sphinx options
