runsvdir: add page

pages/common/runsvdir.md

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+# runsvdir
+
+> Run an entire directory of services.
+
+- Start and manage all services in a directory as yourself.
+
+`runsvdir {{path/to/services}}`
+
+- Start and manage all services in a directory as root.
+
+`sudo runsvdir {{path/to/services}}`
+
+- Start services in seperate sessions.
+
+`runsvdir -P {{path/to/services}}`