Refactor Life at Torchbox to About Us

This MR replaces the URL of life-at-torchbox with about-us

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

torchbox / careers