Update all packages to latest, update outdated Gatsby APIs, convert project to TypeScript

[imjoshin]

This change brings no UI modifications - this is purely a technical change.

This PR has four major changes:

1. Update all packages to latest versions (including Gatsby 5)
2. gatsby-image -> gatsby-plugin-image
3. react-helmet -> Gatsby Head API
4. Typescript

Status

• WIP
• Ready for review
• Deploy preview build succeeded and preview looks good.
• Needs testing

[imjoshin]

The build is failing due to an old NODE_VERSION. Can we update this to 18+?
https://docs.netlify.com/configure-builds/manage-dependencies/#node-js-and-javascript

[keegn]

The build is failing due to an old NODE_VERSION. Can we update this to 18+? https://docs.netlify.com/configure-builds/manage-dependencies/#node-js-and-javascript

Thanks for the PR! Sorry for the delay on my end. Updated the NODE_VERSION for branch and preview deploys and kicked off a new build.