Documentation: REST API link broken

[KaiRoesner]

Describe the bug
In the documentation the link to the REST API is broken, i.e. it gives a 404 error.

To Reproduce
Steps to reproduce the behavior:

1. Go to the Infrabox documentation.
2. Scroll down to the API Documentation section.
3. Click on REST API.
4. See error

Expected behavior
I expected to see the REST API definition.

Screenshots

Something went wrong...
Error downloading https://cors.apis.guru/https://infrabox.ninja/api/swagger.json HTTP ERROR 404

Stack trace

a/<@https://redocly.github.io/redoc/redoc-demo.bundle.js:33:1501
e/</<@https://redocly.github.io/redoc/redoc-demo.bundle.js:21:86584


a/<@https://redocly.github.io/redoc/redoc-demo.bundle.js:33:1501
e/</<@https://redocly.github.io/redoc/redoc-demo.bundle.js:21:86162

ReDoc Version: 2.0.0-rc.46
Commit: faf6fd00

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Firefox
• Version: 84.0.2

Additional context
n/a