refactor: replace yq with a yaml parser implemented with awk/sed

[flexiondotorg]

This has been done to drastically reduce the external dependencies of Stream Sprout, as the Python implementation of yq (which is most widely packaged in distros) has a boat load of Python dependencies.

While this awk/sed implementation doesn't support the full scope of yaml, it is more than sufficient for the limited requirements of Stream Sprout:

• https://stackoverflow.com/questions/5014632/how-can-i-parse-a-yaml-file-from-a-linux-shell-script