[FRONTEND] Add CDN over firebase storage

[choden-dev]

Is your feature request related to a problem? Please describe.

For the event images, currently they are being served raw,

look into this:

https://www.anothermadworld.com/how-to-put-a-cdn-in-front-of-firebase-cloud-storage/

BEFORE MERGING

• Storybooks created where possible
• Tested with nock if data fetching
• Tests written for critical interactions
• PR Reviewed (For non-trivial changes)
• Changes tested after rebasing on master or merging in master (hint: git fetch origin master:master, then git rebase master or git merge master)
• All required PR checks passing