Update Snippets Icon in Navigation
Problem to Solve
Currently the Snippets icon in navigation is a pair of scissors. This doesn't effectively communicate what the feature is or align with other icons that are being used in other parts of Snippets.
Proposal
We should update the icon to better align, potentially with something more code related: http://gitlab-org.gitlab.io/gitlab-svgs/?q=code
Additional Details
Examples of other icon usage are here #225294 (comment 380141662)