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-connect.md

@@ -0,0 +1,28 @@
+# protonvpn connect
+
+> Connect to ProtonVPN.
+> More information: <https://github.com/Rafficer/linux-cli-community>.
+
+- Connect to ProtonVPN interactively:
+
+`protonvpn {{c|connect}}`
+
+- Connect to ProtonVPN using the fastest server available:
+
+`protonvpn {{c|connect}} {{-f|--fastest}}`
+
+- Connect to ProtonVPN using a specific server with a specific protocol:
+
+`protonvpn {{c|connect}} {{server_name}} -p {{udp|tcp}}`
+
+- Connect to ProtonVPN using a random server with a specific protocol:
+
+`protonvpn {{c|connect}} {{-r|--random}} -p {{udp|tcp}}`
+
+- Connect to ProtonVPN using the fastest Tor-supporting server:
+
+`protonvpn {{c|connect}} --tor`
+
+- Display help:
+
+`protonvpn connect --help`