hide nginx and php version

[FF7C7]

Hello.
First of all I want to tell many thanks for your work!

What you did

• git clone repo
• docker-compose up
• edit /etc/hosts
• curl https://passbolt.local -I -k

What happened

$ curl https://passbolt.local -I -k
HTTP/1.1 404 Not Found
Server: nginx/1.10.3
Date: Tue, 19 Jun 2018 20:59:33 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Keep-Alive: timeout=5
X-Powered-By: PHP/7.2.6

What you expected to happen

I expected that the nginx and PHP version will be hidden.

[CLAassistant]

All committers have signed the CLA.

[dlen]

Hi @FF7C7 !!
Thanks for your contribution!!! You are right, we should hide the nginx and php information.
Your PR will be reviewed soon and most likely merged on the next release.