feat: Add disk usage percentage and warn on high usage #133

Job	Run time
Run Cargo Deny (advisories)	41s
Run Cargo Deny (bans licenses sources)	41s
Run Clippy	39s
Run Cargo Udeps	1m 14s
Run Rustfmt	14s
Run RustDoc	3m 59s
Run Cargo Tests	24s
All tests passed	4s
	7m 56s

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