systemd-mount: add page; systemd-umount: add alias page (#10509)

* systemd-mount: add page; systemd-umount: add alias page

---------

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/linux/systemd-mount.md

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+# systemd-mount
+
+> Establish and destroy transient mount or auto-mount points.
+> More information: <https://www.freedesktop.org/software/systemd/man/systemd-mount.html>.
+
+- Mount a file system (image or block device) at `/run/media/system/LABEL` where LABEL is the filesystem label or the device name if there is no label:
+
+`systemd-mount {{path/to/file_or_device}}`
+
+- Mount a file system (image or block device) at a specific location:
+
+`systemd-mount {{path/to/file_or_device}} {{path/to/mount_point}}`
+
+- Show a list of all local, known block devices with file systems that may be mounted:
+
+`systemd-mount --list`
+
+- Create an automount point that mounts the actual file system at the time of first access:
+
+`systemd-mount --automount=yes {{path/to/file_or_device}}`
+
+- Unmount one or more devices:
+
+`systemd-mount --umount {{path/to/mount_point_or_device1}} {{path/to/mount_point_or_device2}}`
+
+- Mount a file system (image or block device) with a specific file system type:
+
+`systemd-mount --type={{file_system_type}} {{path/to/file_or_device}} {{path/to/mount_point}}`
+
+- Mount a file system (image or block device) with additional mount options:
+
+`systemd-mount --options={{mount_options}} {{path/to/file_or_device}} {{path/to/mount_point}}`

pages/linux/systemd-umount.md

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+# systemd-umount
+
+> This command is an alias of `systemd-mount --umount`.
+
+- View documentation for the original command:
+
+`tldr systemd-mount`