Fix repl CI build

[JLHwung]

The REPL CI build is broken because the script ./repl.js can not be found from /repl/build/12345. In this PR we manually inject /repl/repl.js so that it can be imported under /repl/build/12345

We also remove another unused js import minirepl as it has been handled by docusaurus.

Preview URL:

https://deploy-preview-2781--babel.netlify.app/repl/build/54393 https://deploy-preview-2781--babel-next.netlify.app/repl/build/54393

[netlify[bot]]

✅ Deploy Preview for babel-next ready!

Name	Link
🔨 Latest commit	05e8be4c4f27910a674794ae001979d236d1ae5b
🔍 Latest deploy log	https://app.netlify.com/sites/babel-next/deploys/645bd5864b08290008a1e19b
😎 Deploy Preview	https://deploy-preview-2781--babel-next.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[netlify[bot]]

✅ Deploy Preview for babel ready!

Name	Link
🔨 Latest commit	05e8be4c4f27910a674794ae001979d236d1ae5b
🔍 Latest deploy log	https://app.netlify.com/sites/babel/deploys/645bd586bbfda000088c30c5
😎 Deploy Preview	https://deploy-preview-2781--babel.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[JLHwung]

It is working: https://deploy-preview-2781--babel-next.netlify.app/repl/build/54393/#?browsers=ie%2011&build=&builtIns=false&corejs=3.21&spec=false&loose=false&code_lz=PQHQDg3gqgdglgMzgUwCYH0CSrkHsDmATgIZgAWAvsAK5A&debug=false&forceAllTransforms=false&modules=false&shippedProposals=false&circleciRepo=&evaluate=false&fileSize=false&timeTravel=false&sourceType=module&lineWrap=true&presets=env%2Creact%2Cstage-2&prettier=false&targets=&version=7.21.8%2Bpr.15616&externalPlugins=&assumptions=%7B%7D