Swap Zustand for Redux, upgrade to React Router v7

[GV14982]

Description

• refactor: swap redux for zustand, some general cleanup
• deps: upgrade from remix to react-router v7

Checklist

• I have tested these changes
• I have updated documentation as needed

Related Issues

Closes #63

[lyehatten]

When I attempted to go through the sign up flow I kept getting this error
SyntaxError: Unexpected end of JSON input at JSON.parse (<anonymous>) at parseJSONFromBytes (node:internal/deps/undici/undici:5738:19) at successSteps (node:internal/deps/undici/undici:5719:27) at fullyReadBody (node:internal/deps/undici/undici:4609:9) at consumeBody (node:internal/deps/undici/undici:5728:7) at action (/app/web/app/routes/auth.signup/route.tsx:25:16) at callRouteHandler (file:///app/node_modules/.pnpm/react-router@7.7.1_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/react-router/dist/development/chunk-KIUJAIYX.mjs:508:16) at file:///app/node_modules/.pnpm/react-router@7.7.1_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/react-router/dist/development/chunk-C37GKA54.mjs:4209:19 at callLoaderOrAction (file:///app/node_modules/.pnpm/react-router@7.7.1_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/react-router/dist/development/chunk-C37GKA54.mjs:4261:16) at async Promise.all (index 0)

Let me know if I am possibly doing something wrong....