index.cgi: Add wireguard status to home screen

index.cgi: Add wireguard status to home screen

- This fix adds a wireguard line to show when it is enabled.
- This fix does not show a table for any net2net connections that are enabled. I have
   started working on that but as I only have an OpenVPN n2n connection in place, I can't
   test out the copy of the ipsec n2n code section that I have made. I need to get ipsec
   and wireguard n2n connections working first.
- If someone else wants to provide a patch for the wireguard n2n connections tables I have
   no problems with that. If not then I will submit one when I have been able to test it.

Tested-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>