* Switch away from pip-compile-multi in attempt to resurrect Dependabot support
Calling just pip-compile from pip-tools on each input file generates files
with no inheritance/cross-file dependencies, which hopefully will help
Dependabot process them properly
* Update ADRs in light of tooling change
* Delete redundant pip-compile-multi header file
* Update documentation
* Switch to NOT inheriting from prod reqs at all
...and plug the gap with a make command 👍
* Use requirements/prod.txt to constrain the duplicate deps in dev.txt
* Update make command for installing local deps
* Remove unnecessary -U and --no-cache-dir options
* Remove docs dependencies installation from makefile shortcut, because technically it may clash with dev.txt and we don't want developer confusion. The documentation still shows how to install the deps when required
Steve Jalim