smartctl: add page (#1658)

pages/common/smartctl.md

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+# smartctl
+
+> View a disk's SMART data and other information.
+> See https://en.wikipedia.org/wiki/S.M.A.R.T for more information.
+
+- View SMART health summary:
+
+`sudo smartctl --health {{/dev/sda}}`
+
+- View device information:
+
+`sudo smartctl --info {{/dev/sda}}`
+
+- Begin a short self-test:
+
+`sudo smartctl --test short {{/dev/sda}}`
+
+- View current/last self-test status and other SMART capabilities:
+
+`sudo smartctl --capabilities {{/dev/sda}}`
+
+- View SMART self-test log (if supported):
+
+`sudo smartctl --log selftest {{/dev/sda}}`