Content migration - create Optimizing site performance with Guess.js doc

[shannonbux]

Issue Context

This issue is part of the content migration project (#8103), which is meant to take existing content and repurpose it so it's easier to find in the docs.

Motivation

We are doing this because many people have written excellent content that we want to canonize and maintain so more people can find it and benefit from it.

Steps to resolve this issue

Review the Gatsby docs approach

• Read the Style Guide and follow it in order for your PR to be accepted. Pay special attention to the templates.
  • Style Guide: https://www.gatsbyjs.org/docs/gatsby-style-guide/
  • Docs Templates: https://www.gatsbyjs.org/docs/templates/

Draft the doc

• Create a new file named optimizing-site-performance-with-guessjs.md in the docs source directory.
• Begin the newly-created markdown file with the following frontmatter:

---
title: Optimizing site performance with Guess.js
---

• Use the following reference material as a primary starting point to draft the new doc:
  "Framework-based static sites" https://blog.mgechev.com/2018/05/09/introducing-guess-js-data-driven-user-experiences-web/
  https://github.com/gatsbyjs/gatsby/tree/master/packages/gatsby-plugin-guess-js
  https://www.contentful.com/blog/2018/06/13/journey-cutting-edge-static-sites-gatsbyjs-v2/

Make sure you rewrite and adjust the content to follow the format listed in these resources:

• Docs Templates: https://www.gatsbyjs.org/docs/templates/
• Example of a guide to imitate: https://www.gatsbyjs.org/docs/deploying-to-s3-cloudfront
• Review the following additional reference materials, and integrate any additional detail, if helpful:
  • References:
    https://guess-gatsby-wikipedia.firebaseapp.com/
    https://twitter.com/gatsbyjs/status/994277394147000320?lang=en
    https://itnext.io/increase-performance-of-your-angular-react-and-gatsby-apps-with-guess-js-2214d4be0871
    https://github.com/guess-js/gatsby-guess
    https://syndicode.com/2018/07/18/guess-js-libraries-and-tools-for-enabling-data-driven-user-experience-on-the-web/
• Add a link to the doc-links.ymlfile so your newly created doc shows up in the sidebar navigation of the .org site!

Open a pull request

• Open a pull request with your work, including the words "closes Content migration - create Optimizing site performance with Guess.js doc #8846"

[dlaub3]

I'll work on this.

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