Add button towards flatgithub.com #4375

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I thought this is another random GitHub integration, and then I saw it is developed by GitHub 😅 so perhaps the best way is to suggest GitHub supporting it.

For the time being though, you can use the universal integration bookmarklet:

javascript:window.open(`https://some.github.integration.website/${location.pathname.split('/').slice(1, 3).join('/')}`)

As for this issue:

javascript:window.open(`https://flatgithub.com/${location.pathname.split('/').slice(1, 3).join('/')}`)

So it seems that this is a glorified JSON/CSV viewer + separate updater part. I assume GitHub will add their own button at some point, it's rather strange that they haven't already.

We could add the feature if there's a simple indicator that the current file is compatible with Flat GitHub and can benefit from being seen there. The flat.yml check is unnecessary since the viewer works with any CSV or tabular JSON file.

Indicators could include:

• tabular (which I think is [{}, {}, {}, …], not {})
• larger file size (the linked files don't seem to be useful at all in the Flat Viewer)
• ... ?

Here's another example repo https://github.com/the-pudding/data with data that looks great in the viewer: https://github.com/the-pudding/data/blob/master/census-history/full_data.csv

I don’t think it's common/useful enough. Even GitHub decided against it until now