chore(blog post): spell checking

[shadow81627]

Create a blog article about spell checking to improve content quality.

Install

npm i --save-dev write-good markdown-spellcheck cspell

Run in CI/CD

mdspell -r -n -a --en-us *.md || true
write-good *.md || true
cspell content/**

https://rollout.io/blog/improve-documentation-by-automating-spelling-and-grammar-checks/
https://www.npmjs.com/package/markdown-spellcheck
https://www.npmjs.com/package/write-good

https://sendgrid.com/blog/add-a-spellcheck-feature-to-your-nodejs-project/
https://www.npmjs.com/package/cspell