[blocked] New Icon component

[NWylynko]

🔎 Previews:

• https://clerk-git-nick-new-icon-component.clerkstage.dev/docs/pr/2120
• https://clerk-git-nick-new-icon-component.clerkstage.dev/docs/pr/2120/quickstarts/overview
• https://clerk-git-nick-new-icon-component.clerkstage.dev/docs/pr/2120/references/overview

What does this solve?

• Currently we are loading icons twice on the page, firstly clerk.com loads them, then secondly they are loaded in as partials

What changed?

• In this pr https://github.com/clerk/clerk/pull/1083 (waiting for approval) I have introduced a new <Icon /> component that exposes the icons we are using in the partials.
• In this pr I have updated the markdown to use the <Icon /> component

Checklist

• I have clicked on "Files changed" and performed a thorough self-review
• I have added the "deploy-preview" label and added the preview link(s) to this PR description
• All existing checks pass

[github-actions]

Hey, here’s your docs preview: https://clerk.com/docs/pr/2120

[github-actions]

⚠️ Changes found in the following quickstarts:

• overview.mdx

⚠️ Please update the corresponding quickstarts in the Dashboard