Cannot use when fork name differs from upstream repo name

[yajo]

Describe the bug

When your github fork has a different name than upstream repo, you cannot use decapcms.

To Reproduce

I'm using github backend with open authoring in https://github.com/OCA/docs

This repo was before named https://github.com/moduon/oca-docs while it was a prototype. Some users already tested the prototype with Decap CMS and they had forks named oca-docs because of that:

Now, when these users try to use decap-cms in the new site, they cannot because their fork isn't named docs but oca-docs.

Expected behavior

They can use open authoring

Screenshots

Do login. The, click on fork:

Then, the error:

Applicable Versions:

• Decap CMS version: 3.0.0
• Git provider: GitHub
• OS: Ubuntu
• Browser version: Chrome.

CMS configuration

https://github.com/OCA/docs/blob/b79cd4097f188f19a4182bf6ec203e4c6d104eef/static/admin/config.yml

Additional context