📝 Documentation: Add an interactive playground to the site

[JoshuaKGoldberg]

Bug Report Checklist

• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Overview

I recently had someone send me a code snippet using emojiblast. I wanted to try it out, but realized I didn't have any quick 'getting started' sandbox available to do that quickly. Which means users probably are missing out on that too!

I'd like to make an interactive playground where people can try out their own emoji blasts. That way folks can play with the APIs and experience their emojirific power themselves.

Additional Info

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