chore: Links the "gitlab-ui" button to the project page

Sam Beckhamrequested to merge
project-link-url into master

Currently, the button in the top left corner of the page links to the Storybook repo on Github.

This MR updates the config so we link to the project page for GitLab UI instead.

image

It's a small change, but it was bugging me.

Edited by Clement Ho

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