Document that the robotology-superbuild needs to be compiled and installed in build-pc104 on pc104 system with shared /usr/local/src/robot directory

[traversaro]

The .bashrc_iCub of the icub-live image (used on pc104 systems) assumes that the build directory of the robotology superbuild on the pc104 is /usr/local/src/robot/robotology-superbuild/build-pc104, see https://github.com/icub-tech-iit/icub-os-files/blob/5084e7466524ffb8d9198fc67c72bc35b53095a4/scripts/icub-live/live-build/config/includes.chroot/etc/skel/.bashrc_iCub#L20 , as the /usr/local/src/robot/robotology-superbuild directory is tipically (or always? I am not sure on this) shared between the icub laptops and the pc104, different from system base on COM-Express boards that use the iCubOS image.

However, it seems that there is no documentation on the fact that the on pc104 the robotology-superbuild should be compiled in the build-pc104 directory. A possible solution is to add the pc104 to the system covered by the "Installation on specific systems on iCub setup" section of the documentation (see

documentation/mkdocs.yml

Line 138 in 92d0eb1

- Installation on specific systems on iCub setup:

), and the "installing OS" and "installing software" pages should be better harmonize/connected, as tipically anyone that is interested in installing the OS on an icub setup machine is also interested in then installing the software (but perhaps this should be the subject of another issue).

[traversaro]

fyi @Uboldi80 @pattacini @davidelasagna @mbrunettini @Fabrizio69