If you'd like to have it running under e. g. 192.168.0.100:22300:
Skip step 1, 2, 5, 6, 7 and 10.
In step 8 you'd want to set the APP_BASE_URL to the local ip with the protocol in front and a leading :22300 (in this example http://192.168.0.100:22300).
If you'd like to have it running under e. g. 192.168.0.100/joplin:
Skip step 1, 2, 6 and 10.
In step 7 edit /etc/apache2/sites-enabled/000-default.conf instead of /etc/apache2/sites-enabled/000-default-le-ssl.conf (there will be no <VirtualHost *:443> block, but instead a <VirtualHost *:80> block.
In step 8 you would want to set the APP_BASE_URL to the local ip with the protocol in front and a leading /joplin (in this example http://192.168.0.100/joplin).
Remeber: The traffic gets routed without any encryption via plain http.