docs(all): update to use newer wiki repository

- Update URLs logged by program
- Update README.md links
- Update contributing guide link
- Update issue templates links
- Replace Wiki issue template by link to Gluetun Wiki repository issue creation
- Set program announcement about Github wiki new location

internal/openvpn/logs.go

@@ -52,7 +52,7 @@ Your credentials might be wrong 🤨
 That error usually happens because either:
 
 1. The VPN server IP address you are trying to connect to is no longer valid 🔌
-   Update your server information using https://github.com/qdm12/gluetun/wiki/Updating-Servers
+   Check out https://github.com/qdm12/gluetun-wiki/blob/main/setup/servers.md#update-the-vpn-servers-list
 
 2. The VPN server crashed 💥, try changing your VPN servers filtering options such as SERVER_REGIONS
 

internal/openvpn/logs_test.go

@@ -52,7 +52,7 @@ func Test_processLogLine(t *testing.T) {
 That error usually happens because either:
 
 1. The VPN server IP address you are trying to connect to is no longer valid 🔌
-   Update your server information using https://github.com/qdm12/gluetun/wiki/Updating-Servers
+   Check out https://github.com/qdm12/gluetun-wiki/blob/main/setup/servers.md#update-the-vpn-servers-list
 
 2. The VPN server crashed 💥, try changing your VPN servers filtering options such as SERVER_REGIONS