Add copyToClipboard, home, (un)publishedResource icons, generate RST replacements

[nucleogenesis]

Description

Currently, there is no copy icon with the Outline style in KDS - which is necessary in Studio.

In Studio, however, we have not fully applied KIcon and KIconButton and so forth - so there are many icons used there by way of Vuetify's handling of material icons.

But - @radinamatic needs these icons on hand so she can update documentation with access to all of the icons we see in our products, even if the product isn't currently getting the icon from KDS.

Thus I've added it here.

Issue addressed

Fixes #141

Also - the unpublishedChanges and publishedResource icons are tokens.success.

Initially, the closest color we had was brand.secondary which is also tokens.focusOutline - this matched the similar version from Vuetify currently used in Studio.

That did not pass muster as an icon for a11y purposes - so I've opted to use that darker green tokens.success color which passes in the icon context:

Steps to test

1. Go to the deployed Netlify testing site at the bottom here in the "Github Actions" section.
2. Go to icons
3. Type in "copy" to see the two copy icons.
4. Scroll to the bottom for the RST Replacement text - see that the copyToClipboard icon is there and is acceptable.

@jtamiace - do you agree that copyToClipboard is a solid alias for that icon? It matches the actual use of it in Studio anyway. See @indirectlylit 's comment from #141

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@radinamatic does this solve the concerns you had in #141?

[radinamatic]

@nucleogenesis this resolves the outlined copy icon, but not the rest of the missing Studio icons I reported in the #141

If that is what is addressed with this PR, I'm happy to approve 🙂

[radinamatic]

All icons are finally in! 💯

What I don't see are the required colors, primary for the info and secondary for the Resource when I build the docs atm, but I see that all have the defaultColor property in the iconDefinitions.js.

If that is all going to fall in place once this PR is merged, then all's good!

One last thing that might need a retouch are the aliases. Technically, in Studio UI both |publishedResource| (full green dot) and |unpublishedResource| (outlined green dot) indicate unpublished state: full green dot appears when a new resource is added/uploaded, and the outlined green dot appears when topics/resources titles or order are changed (cc @jtamiace and @khangmach to correct me if I'm misunderstanding).

That's why my suggestion from #141 was to use the following aliases:

• |unpublishedResource| for full green dot (currently named |publishedResource| in this PR)
• |unpublishedChange| for outlined green dot (currently named |unpublishedResource| in this PR)

[radinamatic]

💯 🌟s for improving the contrast of that color! 🙏🏽

[jtamiace]

Sorry for the late review! 👍 for the copyToClipboard alias and the suggested ones for the filled/outlined dots