Read the docs install updates

[ZeroChaos-]

This page is a little confusing:
https://ubertooth.readthedocs.io/en/latest/build_guide.html

There is a list of packages to install as prereqs, but then randomly there is a freebsd install section that installs everything, then there is build from source instructions right after that.

It's a bit confusing to say the least. I believe it should be reorganized to include packages at the top (most distros have packages these days) and then source building at the bottom. Additionally a note can be added to not do both source and package install, and maybe a check to run ubertooth-util before building and installing from source and causing conflicts.

[straithe]

Thank you for opening this issue. I would love to see a PR if you are interested in updating these docs.