usability of key + certificate replacement process

replacing my out-of-date certificates was more trouble than I anticipated. Partially because of #28 , but also because of some minor things that should be relatively easy to fix:

• creating a new HTTPS configuration should lead to the "HTTPS Configuration" screen after giving it a name instead of the "Website" screen
• supplying a new certificate should activate the corresponding https configuration per default (or at least offer this as a checkbox option)

And finally (may not be as easy to fix)

• a notification email about https certificates that are about to run out would be really nice =)