Remove Shimo from nav
What does this MR do and why?
This MR removes Shimo from our docs side nav and it is being removed from the codebase (gitlab#377824 and gitlab!114566 (closed)).
Merge request acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this merge request.