chore: Drop 'engines' from package.json

[DafyddLlyr]

Incremental change to get us closer to resolving #1911

I think it's wise to drop this for a few reasons -

• It makes managing version numbers more work (especially compared with repository variables)
• We're not really tied to a version number in a totally hard way (the repo will probably be fine on Node 17)
• We already have .nvmrc in the project root which essentially handles this for us, and details in the readme of required versions
• It's potentially causing issues when upgrading across repositories

[github-actions]

Removed vultr server and associated DNS entries

[jessicamcinchak]

Looks okay to me, seems to be working as expected !