Remove favicon-blue.ico because it's no longer used
What does this MR do?
Remove favicon-blue.ico
because it's no longer used
Why was this MR needed?
All other friends were removed in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14497 /cc @koffeinfrei
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Conform by the code review guidelines
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Has been reviewed by a Frontend maintainer -
Has been reviewed by a Backend maintainer
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What are the relevant issue numbers?
This is part of &27 (closed)