Client-side navigation

[kyle-n]

As proposed in #4

• When the user searches for a category and year, these are saved as URL query parameters in the form of ?category=1&year=1929
• If the user refreshes the page with query params or sends the link to someone else, the site will load with that category and year selected in the dropdown and the correct results showing.
• User can click the title in the top to navigate to the homepage and strip out their query params
• If user opens the site with no query params, it uses Best Picture as the default category

Behind the scenes:

• Searching and client-side state is tracked using category_id instead of normalized_name
• key props for EnrichedLinks to fix console error

[kyle-n]

@RikBoeykens Could you review this PR? Maybe check out the project locally and see if you can find any bugs with the routing implementation?