[GDS] Document base-url redirect issue

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Problem

When running GitLab locally on Docker, GitLab's base URL is set to the Docker hostname by default. Because of this, clicking some links within the GitLab instance will try to redirect you to a URL that looks like:

http://8eda445b1/demo-group/core-apps/issues/1

Rather than

http://localhost:3000/demo-group/core-apps/issues/1

Example of this behavior

https://youtu.be/4ZMLr8oDhqI?t=1274

Proposal

Add documentation to the Data Seeder (especially the Demo Snippet), to set the GitLab Base URL to localhost

Edited by 🤖 GitLab Bot 🤖