docs: reorganize references, and restructure Plugins into Add-ons #1055

Job	Run time
e2e	2m 53s
unit-test / lint	4m 34s
unit-test / test (windows-latest, 24)	5m 0s
unit-test / test (ubuntu-latest, 24)	2m 58s
unit-test / test (windows-latest, 26)	4m 1s
unit-test / test (ubuntu-latest, 26)	2m 53s
unit-test / test (ubuntu-latest, 22)	2m 56s
unit-test / test (windows-latest, 22)	4m 56s
	30m 11s

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