Mozilla SSL Configuration support

[Asteliks]

Is your feature request related to a problem? Please describe.
I love it when setting up security is as simple as possible. For that I love the famous: https://ssl-config.mozilla.org/. As of today I can not simply copy and paste the config into the Custom Nginx Configuration due to duplicate configurations.

Describe the solution you'd like
It would be great if we could just paste the mozilla ssl config into the Custom Nginx Configuration text box. For that we would need the advanced configurations to override the default config

Describe alternatives you've considered
Alternatively we could have a new template in https://github.com/mozilla/ssl-config-generator#creating-templates that would be usable as part of the UI. In this case Mozilla would propose a config that would be modern / intermittent / old and the user could just select it in the Security tab as part of the UI.