docs(orion): add Debian 13 CIX PPA guides for O6 and O6N #3449

Job	Run time
test (commit)	35s
test (push)	41s
test-optional (gitown, manual)	46s
test-optional (check-external-links, manual)	1m 13s
deploy	-1s
build	-8s
	3m 6s

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