Standardize documentation and add Conda configuration for ReadtheDocs #17039

Job	Run time
Check if image exists in registry	8s
pyflakes	3m 38s
cancel	2s
licensing	1m 55s
linux (ubuntu-20.04, debug)	22m 23s
linux (ubuntu-20.04, release)	8m 10s
linux-fpga (ubuntu-20.04, debug)	23m 24s
linux (ubuntu-20.04, codecov)	8m 21s
Build SLES image	53m 8s
Build image	53m 52s
sles	3m 15s
format	5m 27s
tidy	46m 40s
cppcheck	3m 3s
	3h 53m 26s

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