Upgrade GitLab Pages to v0.5.0

Nick Thomas requested to merge (removed):pages-0-5-0 into master

What does this MR do?

Upgrade GitLab Pages to v0.5.0

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Several new features in GitLab Pages, including CORS support. This is needed for a Trello powerup: https://gitlab.com/gitlab-org/gitlab-ce/issues/32042

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Edited by Nick Thomas

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