[chore] investigate npm packages (`mkdirp`)

[zackbradys]

When running npm install it will throw a warning message about mkdirp, which is used by docusaurus-lunr-search:

zackbradys@Zacks-MacBook-Pro hauler-docs % npm install
npm install
npm warn deprecated mkdirp@0.3.0: Legacy versions of mkdirp are no longer supported. Please update to mkdirp 1.x. (Note that the API surface has changed to use Promises in 1.x.)

added 1283 packages, and audited 1284 packages in 5s

326 packages are looking for funding
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found 0 vulnerabilities

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zackbradys@Zacks-MacBook-Pro hauler-docs % npm ls mkdirp

hauler-docs@1.0.x /Users/zackbradys/Documents/Coding/GitHub/hauler-docs
└─┬ docusaurus-lunr-search@3.3.2
  └─┬ hogan.js@3.0.2
    └── mkdirp@0.3.0