sv: add page

pages/common/sv.md

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+# sv
+
+> Control a running runsv service.
+
+- Start a service.
+
+`sv up {{path/to/service}}`
+
+- Stop a service
+
+`sv down {{path/to/service}}`
+
+- Get service status
+
+`sv status {{path/to/service}}`