This commit adds a lot more documentation to the Controller Area
Netwok API. The documentation is move to the networking section.
Signed-off-by: Alexander Wachter <alexander.wachter@student.tugraz.at>
Move guides and APIs into separate directories and cleanup naming
introducing index files rather than named section files.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>