docs(icon): remove sets demo

[bennypowers]

Users should instead see https://ux.redhat.com/foundations/typography

What I did

1. remove the icon sets demo

[changeset-bot]

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Latest commit: d219b0a

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Size Change: 0 B

Total Size: 208 kB

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_{compressed-size-action}

[zeroedin]

We should add an alert at the top of the rh-icon demo page rerouting people to the iconography page. There has been confusion about where to find the icons with the users I've worked with, this would be helpful.

<rh-alert state="info">
  <h2 slot="header">Looking for the icons?</h2>
  <p>All the icons you might need are right at your fingertips! Head over to our <a href="/foundations/iconography/">iconongraphy</a> foundations page to explore the full collection.</p>
</rh-alert>

or something to this effect

[zeroedin]

@bennypowers I went ahead and dropped a commit adding that alert with the link to the iconography page for your review code wise. @marionnegp what are your thoughts on this? Let me know if you want the language changed.