Add guide on how to change the panel domain

[Boy132]

This is largely based on the bots response on "how to change domain":

You have to modify the server_name in your web server pelican.conf file. Don't know where to find it? Type the command .webconf and I will provide more instructions.

If you're using a SSL certificate, remember to also change the SSL paths in pelican.conf file to match your new domain and generate a new certificate: https://pelican.dev/docs/guides/ssl/

Next, modify the app_url in the .env file located at /var/www/pelican by typing nano /var/www/pelican/.env. Restart your web server to apply these changes.

Wings config file must be updated to match the new Panel URL. You can do it manually in the config.yml file located at /etc/pelican or overwrite it completely by copying it from the Panel. Go to Nodes -> -> Configuration to auto-deploy or copy the config file.

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