feat: UI overhaul

[sutterj]

Pull Request

Proposed Changes

• Closes github/ospo#2242
  • Replace ICF pages router with app directory
    • This change comes as a refactor and moves the React components from /src/pages to /src/app
  • Create a standard page layout
    • The app router uses layout files that are inherited by child components
    • The header (for example) is at the highest level layout file (/src/app/layout.tsx) to appear on all pages
  • Customize NextAuth login page
    • Middleware updated to enforce login (/src/middleware.ts)
    • Custom auth pages added for login and error (/src/app/auth)
    • Specify custom pages (/src/app/api/auth/lib/nextauth-options.ts)
  • Fix issue with authentication of JWT being longer than expiration of github token
    • Check current time against token expiration (/src/app/[organizationId]/layout.tsx)
  • Implement new designs for the rest of the pages and flows
    • This was the bulk of the changes with new files/dirs being created for components (contained in /src/app)

Readiness Checklist

Author/Contributor

• If documentation is needed for this change, has that been included in this pull request
• run npm run lint and fix any linting issues that have been introduced
• run npm run test and run tests

Reviewer

• Label as either bug, documentation, enhancement, infrastructure, maintenance, or breaking

[ahpook]

Operations I've tried:

• login ✅
• filter forks in 'find a fork' box ✅
• follow pagination breadcrumbs forward and back, both numbers and previous/next nav ✅
• follow a link to a fork ✅
• use the search bar on the mirror page to filter to a subset of mirrors ✅
• use the ... context - edit - rename a mirror ✅
• use the + Create mirror to create a new mirror ✅
• use the ... context - delete mirror 🗑️ to remove it ✅

things i noticed

• the org name at the header takes me to the organization page, from a repo's mirrors page i sort of expected it to navigate back up to the list of all forks
• the pagination at 5 seems pretty small, maybe the default could be increased to 10 or the pagination value selectable
• Need to think about showing the discrepancy between the number of branches listed on the All forks page and the mirrors page - it says "17" for metrics but only 3 mirrors, what are the others? (Related to Simplify/rethink branch->mirror relationship #114)

Overall this is super awesome work and a huuuuuuge uplift for the app overall!!

[ahpook]

(none of my comments above should be considered a blocker for merging this BTW, all follow-up ideas)

[ahpook]

Couple nits that I will make follow-up issues for but I ran through the app and all the functionality works and looks a m a z i n g 👍 🚀