The files you find under "files" folder were created using Nicepage as a test.
The page i made myself are under the folder named "my_files".
To host this site locally using raspberry pi you will need "Apache2". You can install it using
sudo apt install apache2
After you installed it you can go to /var/www/html/ and replace the index file with the website files you just downloaded. You can then access the site in your browser by using raspberry pi's IP address.
Plugin Tutorial for future reference is here
Minecraft Bedrock Server Tutorial reference is here