I moved the default "hello.js" files in an archive folder and moved my React App build in the var/www/html folder but I see no changes

I followed the steps Sammy the shark showed me regarding the “Get your code on here” section of the default landing page

• Launch your app by calling pm2 start <your-file>, then map the port your app runs on to an HTTP URL by running nano /etc/nginx/sites-available/default and adding another location. Use the existing entry for the port 3000 “hello” app as a basis.

• Call sudo systemctl restart nginx to enable your new nginx config.
• Call pm2 save to schedule your code to run at launch.

I expected to at least see an error message because I moved the “hello.js” and “index.nginx-debian.html” files into another directory but I still see the “Sammy welcomes you to your droplet” page when I visit my domain.

here is what my /var/www/html/archive directory looks like (where I moved the old files)

and here is what’s in my /var/www/html/ directory (populated with my react app build files)

and this is my default “sites-available” file. I left it unchanged since I didn’t need to change the destination it was pointing to

I’m very new at this and I’m learning a lot about how a website is hosted and served. But I’m not sure if I did something wrong or if I missed a step.

How is my domain still loading the default digitalocean landing page when I moved it to another directory? and why are my new react app build’s index.html file not being detected?

(my droplet is running Node JS on Ubuntu 20.04)