* Add a migration warning to the update release system and the elf
programs documentation pages. This is just to add a papertrail from
where the documentation originate in case of error during the migration
process.
* Improve the building nuttx with app out of source tree
* Add new guide pages
* Building uclibc++
* Custom app directories
* Debugging ELF loadable modules
* Multiple NSH sessions
* NSH network link management
* RAM & ROM disks
* Reading CAN messages
* Remove device drivers with NSH
