[ROS2] Install using `apt` where possible

[Amal Nanavati]

Currently, many of our installs, particularly in ada_feeding_perception, use pip. There are two issues with this:

1. Every user needs to separately run pip installs, whereas apt installs run on a computer level.
2. The pip version of OpenCV sometimes gives this error, whereas the apt version does not.

Therefore, we should systematically go through our pip installation instructions, determine if there is a apt version of the package, and if so change the documentation to use that version instead.

[Amal Nanavati]

Addressed with #162