OpenVPN is the service that is allowing you to connect from outside to your local network, basically a VPN server.
By connecting to it, it creates a tunnel and your traffic is routed through it, and have access to your local network through the internet. The internal services, as in this case a HTTP Server, that you have on your network are not forwarded ...
The answer is: it depends.
In general: before you move, make a backup. In that way you do not loose any data.
The rest depends a bit on how different the set-up will be in the new location and what the server actually does. If it is just an in-house server, and the IP plan is the same and the SSID/PSK are the same, it should just work. If anything changes,...
Overall, I just want to visit (say) 192.168.0.1 (or whatever my Pi's
IP is) on a local network and have my custom webpage show up.
If you didn't change any config file of Nginx (I mean root section of /etc/nginx/sites-available), you can put your .html file into this location:
In addition, read this simple documentation to configure ...
Option 1: Using iptables
The Network Authentication Type didn't work for me. But redirecting using iptables did the trick. These commands found here
iptables -t nat -A PREROUTING -p tcp --dport 443 -j DNAT --to-destination localhost:80
iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to-destination localhost:80
This redirects all requests ...