Update Server-Setup.md

docs/Server-Setup.md

@@ -1,5 +1,10 @@
+### Setup of https://btc-explorer.com on Ubuntu 16.04
+
     apt update
     apt upgrade
     apt install git python-software-properties
     curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
     npm install pm2 --global
+    apt install nginx
+    
+Copy content from [./btc-explorer.com.conf](./btc-explorer.com.conf) into `/etc/nginx/sites-available/btc-explorer.com.conf`