Add Docusaurus 2 blog post

[slorber]

Summary

Add blog post draft for the Jest migration to Docusaurus v2, cc @SimenB

Test plan

Preview: https://deploy-preview-11092--jestjs.netlify.app/blog/2021/02/17/jest-website-upgrade

---

Note: when we are ready to go live, I'll update the blog post date

[netlify]

Deploy preview for jestjs ready!

Built with commit 29cb38f

https://deploy-preview-11092--jestjs.netlify.app

[codecov-io]

Codecov Report

Merging #11092 (edf4d3d) into jest-website-v2 (554173f) will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           jest-website-v2   #11092   +/-   ##
================================================
  Coverage            64.22%   64.22%           
================================================
  Files                  305      305           
  Lines                13255    13255           
  Branches              3235     3235           
================================================
  Hits                  8513     8513           
  Misses                4050     4050           
  Partials               692      692           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 554173f...edf4d3d. Read the comment docs.

[SimenB]

I like it 👍

[SimenB]

this is a merged pull request. Do we have an issue, or should we ask people to open up a new issue?

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.
Please note this issue tracker is not a help forum. We recommend using StackOverflow or our discord channel for questions.