Visually display customizable search keyboard shortcut to user

[vhscom]

Feature request

Problem or desire

#2278 added keyboard shortcuts for search and, I believe, collapsing the sidebar. In order to make it easier for users to discover keyboard shortcuts associated with search I'd like the ability to display a kbd key combo so users can quickly find it like:

Proposal

Add and style a presentational keyboard shortcut key for sighted users. If there's more than one keyboard shortcut for search, allow the user to pick one keyboard option to display to the user.

Implementation

Something like:

<kbd class="keyboard-shortcut"><span class="keyboard-shortcut-keys">⌘</span>K</kbd>