docs: reorganize references, and restructure Plugins into Add-ons #1049

Job	Run time
e2e	3m 10s
unit-test / test (ubuntu-latest, 26)	3m 1s
unit-test / lint	3m 49s
unit-test / test (windows-latest, 24)	6m 7s
unit-test / test (windows-latest, 26)	4m 17s
unit-test / test (ubuntu-latest, 22)	2m 57s
unit-test / test (windows-latest, 22)	4m 44s
unit-test / test (ubuntu-latest, 24)	2m 45s
	30m 50s

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