Deployed diff view is broken

A [Github workflow](https://github.com/guardian/commercial-request-parser/blob/da7cc4be32f341bcf757c8078eefd8e7c94c9915/.github/workflows/gh-pages.yml) was added in 2025 to replace the manual deploy to Github Pages from [a branch](https://github.com/guardian/commercial-request-parser/tree/gh-pages) added in 2022.

Ever since this happened, the diffing tool has been broken on the deployed page. The request parser itself still works; it is specifically the _diff view_ that no longer works.

The diff tool still works when running locally, however. So if you need this part of the tool, this is the current workaround until we fix the underlying issue.

This commit https://github.com/guardian/commercial-request-parser/commit/8fba8410c9da92b7037b0036aad1f4006f289e58 marks the first commit after the previous deploy, and the last time a "vendor" js file was included in the `dist/assets` directory