docs: add docs for RTD #1242

Job	Run time
Build	37s
Build	37s
Integration (1.7.*, 5.21/stable, lxd, 5.21, 2.9)	34m 42s
Integration (1.7.*, 5.21/stable, lxd, 5.21, 2.9)	34m 42s
Integration (1.7.*, 5.21/stable, lxd, 5.21, 3)	13m 53s
Integration (1.7.*, 5.21/stable, lxd, 5.21, 3)	13m 53s
Integration (1.7.*, 5.21/stable, microk8s, 1.28-strict, 3.1)	45m 37s
Integration (1.7.*, 5.21/stable, microk8s, 1.28-strict, 3.1)	45m 37s
Integration (1.7.*, 5.21/stable, microk8s, 1.28-strict, 3)	12m 10s
Integration (1.7.*, 5.21/stable, microk8s, 1.28-strict, 3)	12m 10s
Integration (1.8.*, 5.21/stable, lxd, 5.21, 2.9)	14m 9s
Integration (1.8.*, 5.21/stable, lxd, 5.21, 2.9)	14m 9s
Integration (1.8.*, 5.21/stable, lxd, 5.21, 3)	14m 11s
Integration (1.8.*, 5.21/stable, lxd, 5.21, 3)	14m 11s
Integration (1.8.*, 5.21/stable, microk8s, 1.28-strict, 3.1)	45m 20s
Integration (1.8.*, 5.21/stable, microk8s, 1.28-strict, 3.1)	45m 20s
Integration (1.8.*, 5.21/stable, microk8s, 1.28-strict, 3)	12m 37s
Integration (1.8.*, 5.21/stable, microk8s, 1.28-strict, 3)	12m 37s
Integration (1.9.*, 5.21/stable, lxd, 5.21, 2.9)	13m 46s
Integration (1.9.*, 5.21/stable, lxd, 5.21, 2.9)	13m 46s
Integration (1.9.*, 5.21/stable, lxd, 5.21, 3)	51s
Integration (1.9.*, 5.21/stable, lxd, 5.21, 3)	27m 57s
Integration (1.9.*, 5.21/stable, microk8s, 1.28-strict, 3.1)	45m 25s
Integration (1.9.*, 5.21/stable, microk8s, 1.28-strict, 3.1)	45m 25s
Integration (1.9.*, 5.21/stable, microk8s, 1.28-strict, 3)	12m 24s
Integration (1.9.*, 5.21/stable, microk8s, 1.28-strict, 3)	12m 24s
	9h 18m 30s

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