We should add more details to the web app manifest file

[jbampton]

https://developer.mozilla.org/en-US/docs/Web/Manifest

Most web browsers show the "application" tab with a panel for the "manifest".
Currently the site shows like this in Firefox:

https://developer.mozilla.org/en-US/docs/Web/Manifest/background_color
https://developer.mozilla.org/en-US/docs/Web/Manifest/short_name

And in the homepage HTML markup we have

<meta name="theme-color" content="#282661">

https://developer.mozilla.org/en-US/docs/Web/Manifest/theme_color

For reference

https://web.dev/add-manifest/

[bproffitt]

@jbampton What's the benefit of this? Genuinely asking. Also, do you have suggestions on what to add?