protonvpn-cli, protonvpn-cli-connect: fix link and update pages (#13860)

* protonvpn-cli: fix link

* Update and rename protonvpn-cli.md to protonvpn.md

* Update and rename protonvpn-cli-connect.md to protonvpn-connect.md

pages/linux/protonvpn.md

@@ -0,0 +1,33 @@
+# protonvpn
+
+> Unofficial third-party ProtonVPN client.
+> See also: `protonvpn-connect`.
+> More information: <https://github.com/Rafficer/linux-cli-community>.
+
+- Initialize ProtonVPN profile:
+
+`protonvpn init`
+
+- Connect to ProtonVPN interactively:
+
+`protonvpn {{c|connect}}`
+
+- Display connection status:
+
+`protonvpn {{s|status}}`
+
+- Disconnect from ProtonVPN:
+
+`protonvpn {{d|disconnect}}`
+
+- Reconnect or connect to the last server used:
+
+`protonvpn {{r|reconnect}}`
+
+- Refresh OpenVPN configuration and server data:
+
+`protonvpn refresh`
+
+- Display help for a subcommand:
+
+`protonvpn {{subcommand}} --help`