F/54/optimise images

[achoo-o]

Before creating a pull request, make sure the following tests pass: npm test npm run lint npm run format npm run typecheck

I have ensured:

• [x] All terminal commands listed above have run and passed.
• [x] Code fulfils the user story and scenarios set out in my ticket.
• [x] The feature has been thoroughly manually tested

You will get a code review from your pair partner or whoever is available. After any comments are addressed, the branch can be merged to main!