feat(vue): Introduce Vue SDK Quickstart

[wobsoriano]

Important

🔎 Previews:

• https://clerk.com/docs/pr/1709/quickstarts/vue
• https://clerk.com/docs/pr/1709/quickstarts/overview#frontend

Explanation:

• We are launching an official Vue SDK for Clerk! 🎉
• This SDK is coming from the community SDK I help maintain - https://www.vue-clerk.com/
• The Vue SDK PR has been merged, and 0.0.1 version released

This PR:

• Adds the initial Vue SDK quickstart guide (quickstart repo here, 1:1 with the guide)
• Sets the foundation for upcoming Vue documentation PRs
• The continuation of this PR is here

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/1709