Upgrade template to Next.js 14

[connor-baer]

Purpose

Next.js 14 was released recently. More importantly, Next.js 13.5 added the experimental optimizePackageImports config which unlocks the use of Circuit UI components in React server components.

Approach and changes

• Upgrade the create-next-app template to Next.js 14
• Migrate the template from the pages to the app folder
  • Use the new metadata API
  • Remove the layouts folder to avoid confusion with layout files
  • Remove the default custom error pages to encourage developers to customize them.

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests
• Meets minimum browser support
• Meets accessibility requirements

[changeset-bot]

🦋 Changeset detected

Latest commit: 7050c05

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@sumup/cna-template	Major

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
oss-circuit-ui	✅ Ready (Inspect)	Visit Preview	Nov 10, 2023 1:34pm

[codecov]

Codecov Report

Merging #2290 (7050c05) into main (960ad6c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2290   +/-   ##
=======================================
  Coverage   97.15%   97.15%           
=======================================
  Files         251      251           
  Lines       19862    19862           
  Branches     1224     1224           
=======================================
  Hits        19297    19297           
  Misses        551      551           
  Partials       14       14