Important Announcement: Updated Librealsense Package Installation Instructions

Hi everyone,

A new RealSense signing key for the librealsense SDK packages has been introduced and the package installation instructions have been updated by the RealSense team.  If you use packages for installation then please read the new instructions, as all users will need to use this procedure at least once to update.

https://github.com/realsenseai/librealsense/blob/master/doc/distribution_linux.md#installing-the-packages