Suggestions to improve documentation

[Kyogre]

1. In https://syspass-doc.readthedocs.io/en/3.1/installing/centos7.html there is incorrect link:
   Sites only accessible from LAN: https://doc.debian.org/configuration/Self-Signed_Certificate

It should be https://wiki.debian.org/Self-Signed_Certificate if I am correct or maybe some centos specific

2. In https://syspass-doc.readthedocs.io/en/3.1/installing/centos7.html#environment-configuration there is url example:

Please, point your web browser to the following URL and follow the installer steps
https://IP_OR_SERVER_ADDRESS/syspass/index.php

There need to be mentioned, that http is also works if user haven't setup certificate.

3. In docs:
   3.1. Need to replace sysPass to syspass
   3.2. Not everybody knows apache configuring. I suggest to specify where to place .htaccess file, or where to put site configuration. For me it works if I create /etc/httpd/conf.d/syspass.conf, write your configuration here and restart httpd service.

4. In https://syspass-doc.readthedocs.io/en/3.1/application/authentication.html there is link https://syspass-doc.readthedocs.io/en/3.1/application/%60https://en.wikipedia.org/wiki/Blowfish_(cipher)%60 which needs to be https://en.wikipedia.org/wiki/Blowfish_(cipher)

5. In https://syspass-doc.readthedocs.io/en/3.1/faq.html need to describe What are clients?