Adding a file to IPFS and reading from it

I cloned this example repo for angular and was able to add a file to IPFS successfully. Since I am quite a newbie in the IPFS spectrum, my question will perhaps sound a bit basic. Should I assume that this angular example (available at http://localhost:4200) spawns an IPFS node in the browser? If so, where can I configure the port numbers? When I added the “Hello world” file to this IPFS, I was able to retrieve it from gateway. What if I want the angular app to connect to my isolated gateway running on a docker image on my development laptop? Am I missing a point?

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