Adopting Next.js Edge Runtime

[MaxSchaefer]

We should adopt the Edge Runtime of Next.js to run the tasks on Cloudflare Pages. The goal is to build the project with the following Next.js config:

...
  experimental: {
    runtime: 'edge'
  }
...

In a follow-up issue, we will deploy tasks via CF Pages.

• https://nextjs.org/docs/api-reference/edge-runtime
• https://developers.cloudflare.com/pages/framework-guides/deploy-a-nextjs-site/#configure-the-project-to-use-the-edge-runtime