Ability to remove Gitlab Pages default URL if custom URL added.
### Problem to solve After adding custom domain under GitLab Pages, allow the default URL (username.gitlab.io) to be removed. ### Further details Avoids links to incorrect URL, or Google/web searches to Gitlab.io URL rather than custom domain. ### Proposal Allow default username.gitlab.io URL to be deleted (if custom domain is connected) ### What does success look like, and how can we measure that? It works... ### Links / references
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