runit, runsv, runsvdir, runsvchdir, sv: add more information link and move to common/ (#5648)

pages/common/runit.md

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+# runit
+
+> 3-stage init system.
+> More information: <https://wiki.archlinux.org/index.php/Runit>.
+
+- Start runit's 3-stage init scheme:
+
+`runit`
+
+- Shut down runit:
+
+`kill --CONT {{runit_pid}}`

pages/common/runsv.md

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+# runsv
+
+> Start and manage a runit service.
+> More information: <https://manpages.ubuntu.com/manpages/latest/man8/runsv.8.html>.
+
+- Start a runit service as the current user:
+
+`runsv {{path/to/service}}`
+
+- Start a runit service as root:
+
+`sudo runsv {{path/to/service}}`

pages/common/runsvchdir.md

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+# runsvchdir
+
+> Change the directory `runsvdir` uses by default.
+> More information: <https://manpages.ubuntu.com/manpages/latest/man8/runsvchdir.8.html>.
+
+- Switch `runsvdir` directories:
+
+`sudo runsvchdir {{path/to/directory}}`

pages/common/runsvdir.md

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+# runsvdir
+
+> Run an entire directory of services.
+> More information: <https://manpages.ubuntu.com/manpages/latest/man8/runsvdir.8.html>.
+
+- Start and manage all services in a directory as the current user:
+
+`runsvdir {{path/to/services}}`
+
+- Start and manage all services in a directory as root:
+
+`sudo runsvdir {{path/to/services}}`
+
+- Start services in separate sessions:
+
+`runsvdir -P {{path/to/services}}`

pages/common/sv.md

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+# sv
+
+> Control a running runsv service.
+> More information: <https://manpages.ubuntu.com/manpages/latest/man8/sv.8.html>.
+
+- Start a service:
+
+`sudo sv up {{path/to/service}}`
+
+- Stop a service:
+
+`sudo sv down {{path/to/service}}`
+
+- Get service status:
+
+`sudo sv status {{path/to/service}}`