Please re-read how you installed Moodle via git. There's your path that goes into the moodle.conf.
Again, what does /sbin/ifconfig [ENTER] show as the IP address of the machine in question. IF you are on a private network (a 192.168.1.x) then your Mikrotik RouterBoard needs to translate/allow port 80 traffic for the public IP address to go to the private IP address.
Not sure you are an ISP as the ip you've shared:
inetnum: 188.8.131.52 - 184.108.40.206
And, this gets interesting, IF you use the private IP in the moodle.conf then the server won't really function from outside. If you use the public IP address in the moodle.conf then only visitors outside your private net can see the moodle render properly.
The only way to get both inside and outside is to register a hostname for a domain you own, and then once that is responding correctly in DNS, change the IP address in the moodle.conf to the fully qualified domain name.
There are apps one might have to install to get your private IP machine to announce itself to an outside DNS server as being available. Something like noip DNS http://www.no-ip.com/
Am certain there are others who host a moodle in their high speed connection from home. Maybe they could share how they have set up their network and Moodle!!!
'spirit of sharing', Ken