Add sitemap to Docusaurus

[tcvan0707]

Issue This PR Addresses

Fixes #2926

Type of Change

• Bugfix: Change which fixes an issue
• New Feature: Change which adds functionality
• Documentation Update: Change which improves documentation
• UI: Change which improves UI

Description

This PR will add the sitemap plugin for Docusaurus, and it will create sitemaps so search engine crawlers can crawl our docs website more accurately.

Based on the docs:

This plugin is always inactive in development and only active in production because it works on the build output.

Because of that, right now I am not sure how to test this one locally yet.

Checklist

• Quality: This PR builds and passes our npm test and works locally
• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not (if applicable)
• Documentation: This PR includes updated/added documentation to user exposed functionality or configuration variables are added/changed or an explanation of why it does not(if applicable)

[gitpod-io]

[cindyorangis]

Yeah, we need #2993 to be resolved before we can test this on staging and production but I believe this is all we need to get done for the sitemap.

[humphd]

Do we not need to install this plugin and have it added to package.json? https://docusaurus.io/docs/api/plugins/@docusaurus/plugin-sitemap

[tcvan0707]

Do we not need to install this plugin and have it added to package.json? https://docusaurus.io/docs/api/plugins/@docusaurus/plugin-sitemap

We are using @docusaurus/preset-classic, so we don't need to install plugin-sitemap as a dependency. We just need to configure this plugin inside the preset option