core: frontend: Add disk-usage page #2084

Job	Run time
frontend-tests	1m 56s
python-tests	3m 7s
deploy-docker-images (core, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	10m 6s
deploy-docker-images (bootstrap, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	2m 42s
deploy-raspberry-image	0s
	17m 51s

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