Update to Next.js version 13

Update the Next.js version to 13
Update React to 18
Generally update dependencies where minor version upgrades have occured.
Remove unmaintained Next Redirect library, replace with getStaticProps redirect.
Update all links in the site to support legacy behaviour (breaking change from latest Next.js version)
Update image to use legacy version (breaking change from latest Next.js version)

Navigate through the preview site.

[x] Add a description of your pull request and instructions for the reviewer to verify your work.
[x] If your pull request is for a specific ticket, link to it in the description.
[x] Stay on point and keep it small so the merge request can be easily reviewed.
[x] Consider adding unit tests, especially for bug fixes. If you don't, tell us why.
[ ] Tests and linting passes.
[x] Consider updating documentation. If you don't, tell us why.
[x] If relevant, list the environments / browsers in which you tested your changes.

torchbox / careers