protonvpn-cli: add page (#6255)

pages/linux/protonvpn-cli-connect.md

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+# protonvpn-cli connect
+
+> Official client to connect to ProtonVPN from the command-line.
+> More information: <https://protonvpn.com/support/linux-vpn-setup/>.
+
+- Connect to ProtonVPN interactively:
+
+`protonvpn-cli connect`
+
+- Connect to ProtonVPN using the fastest server available:
+
+`protonvpn-cli connect --fastest`
+
+- Connect to ProtonVPN using a specific server with a specific protocol:
+
+`protonvpn-cli connect {{server_name}} --protocol {{udp|tcp}}`
+
+- Connect to ProtonVPN using a random server with a specific protocol:
+
+`protonvpn-cli connect --random --protocol {{udp|tcp}}`
+
+- Connect to ProtonVPN using the fastest Tor-supporting server:
+
+`protonvpn-cli connect --tor`
+
+- Display help:
+
+`protonvpn connect --help`

pages/linux/protonvpn-cli.md

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+# protonvpn-cli
+
+> Official client for ProtonVPN service from the command-line.
+> More information: <https://github.com/ProtonVPN/linux-cli>.
+
+- Log in to the ProtonVPN account:
+
+`protonvpn-cli login {{username}}`
+
+- Start a kill switch upon connecting to ProtonVPN:
+
+`protonvpn-cli killswitch --on`
+
+- Connect to ProtonVPN interactively:
+
+`protonvpn-cli connect`
+
+- Display connection status:
+
+`protonvpn-cli status`
+
+- Block malware using ProtonVPN NetShield:
+
+`protonvpn-cli netshield --malware`
+
+- Disconnect from ProtonVPN:
+
+`protonvpn-cli disconnect`
+
+- Display the current ProtonVPN configuration:
+
+`protonvpn-cli config --list`
+
+- Display help for a subcommand:
+
+`protonvpn-cli {{subcommand}} --help`