Remove mural update step from left-nav change issue template
What does this MR do and why?
The mural file linked in the issue template for making left nav change proposals is very outdated. I recommend we remove this step from our process.
MR 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 MR.