Does not recognize when it has access through an organization

For some reasons[^1] my clone of cpython is not a repository on my user but on the https://github.com/chrysn-pull-requests, which is technically an organization.

I've gone through the initial setup steps of the blurb-it online app, and as part of that allowed it access to my repository https://github.com/chrysn-pull-requests/cpython, but after returning to https://blurb-it.herokuapp.com/, I still just see "Please install the blurb-it GitHub App, and enable it on your CPython repository." (Then when I follow the install link, GitHub shows it as already installed for chrysn-pull-requests and gives me a link to configure it).

Maybe this is just a recognition problem in the start page, and I can jump to the actual app with the right deep link?

[^1]: Irrelevant to this PR, but if curious: I dislike how GitHub mangles the terms "forking" and "creating a branch", and thus keep a separate group of repositories that I do not intend to fork, but just have branches on.

Start at the blurb-it online app's start page and reproduce the setup with the GitHub App installed for the chrysn-pull-requests organization and its cpython repository. Trace how the page checks repository access; done means an organization-owned repository is recognized or the user receives a working deep link to the app.