dos/{dir, exit, imgmount, ipxnet, keyb}: add pages (#20862)

Co-authored-by: Ivan Baluta <ivanbaluta.dev@gmail.com>

pages/dos/dir.md

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+# DIR
+
+> List files and directories.
+> More information: <https://www.dosbox.com/wiki/Commands#DIR>.
+
+- List current directory:
+
+`DIR`
+
+- Pause per page:
+
+`DIR /p`
+
+- Wide view:
+
+`DIR /w`

pages/dos/exit.md

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+# EXIT
+
+> Exit DOSBox.
+> More information: <https://www.dosbox.com/wiki/Commands#EXIT>.
+
+- Exit DOSBox:
+
+`EXIT`

pages/dos/imgmount.md

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+# IMGMOUNT
+
+> Mount disk or CD-ROM images.
+> More information: <https://www.dosbox.com/wiki/IMGMOUNT>.
+
+- Mount floppy:
+
+`IMGMOUNT a {{floppy.img}}`
+
+- Mount CD-ROM:
+
+`IMGMOUNT d {{cd.iso}}`

pages/dos/ipxnet.md

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+# IPXNET
+
+> Emulate IPX networking for multiplayer games (client-server model).
+> More information: <https://www.dosbox.com/wiki/Connectivity>.
+
+- Start IPX server (default UDP port 213):
+
+`IPXNET startserver`
+
+- Start server on specific port:
+
+`IPXNET startserver {{19900}}`
+
+- Connect client to server IP:
+
+`IPXNET connect {{192.168.2.100}}`
+
+- Connect with specific port:
+
+`IPXNET connect {{192.168.2.100}} {{19900}}`
+
+- Check network status:
+
+`IPXNET status`
+
+- Ping to test speed/clients:
+
+`IPXNET ping`
+
+- Disconnect client:
+
+`IPXNET disconnect`
+
+- Stop server (after clients disconnect):
+
+`IPXNET stopserver`

pages/dos/keyb.md

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+# KEYB
+
+> Change keyboard layout.
+> More information: <https://www.dosbox.com/wiki/KEYB>.
+
+- Set layout:
+
+`KEYB {{us|uk|gr|...}}`