Add graphql voyager

[simon-wacker]

In 16bd511 I tried to add voyager as a next.js page using the React component. This fails with the error

info  - Loaded env from /home/node/app/.env.local
info  - Linting and checking validity of types
info  - Creating an optimized production build
info  - Compiled successfully
info  - Collecting page data ...ReferenceError: window is not defined
    at Object.<anonymous> (/home/node/app/node_modules/graphql-voyager/dist/voyager.lib.js:16:4)
    at Module._compile (node:internal/modules/cjs/loader:1218:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1272:10)
    at Module.load (node:internal/modules/cjs/loader:1081:32)
    at Module._load (node:internal/modules/cjs/loader:922:12)
    at Module.require (node:internal/modules/cjs/loader:1105:19)
    at require (node:internal/modules/cjs/helpers:103:18)
    at 3226 (/home/node/app/.next/server/pages/graphql-voyager.js:22:50)
    at __webpack_require__ (/home/node/app/.next/server/webpack-runtime.js:25:42)
    at __webpack_exec__ (/home/node/app/.next/server/pages/graphql-voyager.js:108:39)

> Build error occurred
Error: Failed to collect page data for /graphql-voyager
    at /home/node/app/node_modules/next/dist/build/utils.js:963:15
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  type: 'Error'
}
error Command failed with exit code 1.

when running yarn build.

In 76bbe41 I tried to add it as a standalone Docker service akin to https://github.com/graphql-services/graphql-voyager This works in general. The current implementation is still buggy though. It is however rather tedious because it requires yet another Dockerfile* pair and so forth.