Ft/search params and links

[hirwaaldo1]

This PR covers the following content (from scrimba)

1. Search Params Intro
2. useSearchParams
3. Challenge: Set up search params in VanLife
4. Filter the array w/ the search param
5. Challenge: Filter the vans in VanLife
6. using Links to add search params
7. Challenge: Filter the vans with Links
8. Using the search params setter function
9. Challenge: Filter the vans with a setter function
10. Caveats to setting params
11. Merging search params with Links
12. Merging search params with the setSearchParams function
13. Challenge: Conditional rendering practice
14. Fix remaining absolute paths
15. Back to all vans
16. Link state
17. useLocation
18. Challenge: conditionally render the back button text
19. 19.404 Page
20. "Happy Path" vs. "Sad Path"
21. Quick update to our fetching code
22. Coding the Sad Path - Loading state
23. Coding the Sad Path - Error handling

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