Clean up code smells

[seanlowe]

Clean up bad code practices and/or remnants of more complex functionality that was refactored:

detailView.jsx:

• double switch in currentApiUrl useEffect (left over from first iteration of pagination and forgot to clean up. Used double switch instead of multiple nested if statements.)
• remove unnecessary fragment wrappers in renderPhotos. I think I added these in before I changed how I was returning JSX in that section and didn't remove the newly unneeded fragments.
• change unnecessary div to fragment in default return

helpers.jsx

• change Int to Number in JSDoc.... we're in JS

list.jsx

• change unnecessary div to fragment in default return