Inputs overview (#516)

* first draft inputs overview

* updates nav with javascript/inputs

* Apply suggestions from Fil review

Co-authored-by: Philippe Rivière <[email protected]>

* updates to use olympians, uses lowercase and 'inputs' throughout

* case fixes and minor update

Co-authored-by: Philippe Rivière <[email protected]>

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Co-authored-by: Allison Horst <[email protected]>
Co-authored-by: Philippe Rivière <[email protected]>

Author: 3 people