wg, wg-quick: add page (#5260)

pages/linux/wg-quick.md

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+# wg-quick
+
+> Quickly set up WireGuard tunnels based on config files.
+> More information: <https://www.wireguard.com/quickstart/>.
+
+- Set up a VPN tunnel:
+
+`wg-quick up {{interface_name}}`
+
+- Delete a VPN tunnel:
+
+`wg-quick down {{interface_name}}`

pages/linux/wg.md

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+# wg
+
+> Manage the configuration of WireGuard interfaces.
+> More information: <https://www.wireguard.com/quickstart/>.
+
+- Check status of currently active interfaces:
+
+`sudo wg`
+
+- Print a new private key:
+
+`wg genkey`
+
+- Print a new public key:
+
+`echo {{private_key}} | wg pubkey`
+
+- Generate a public and private key:
+
+`wg genkey | tee {{privatekey.txt}} | wg pubkey > {{publickey.txt}}`