This site is

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Everything, the web page, forum, mobile site on this site is hosted on a the same raspberry Pi 4.

This is intended as a proof of concept.

It runs lighttpd, mariadb(mysql) for the forum, Php 7,
even pi-hole for local DNS filtering and lightening fast requests.

The site was writen in notepad++ in HTML with some PHP
("include" fonction mainly) to share menus across pages.
The site weight about 40 KB ! + the Forum & Database

You can see the php live output here PHP Info