[Docs] Add Slack 60-second quickstart #4763

Job	Run time
Lint	22s
Type Check	20s
Deployment artifacts	23s
Knip	32s
Detect worker image changes	6s
Test	55s
Docker Build (app, amd64)	2m 48s
Upgrade Compatibility	1m 47s
Fresh-host Backup Restore	1m 9s
Docker Build (${{ matrix.app }}, ${{ matrix.arch }})	-1s
	8m 21s

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