Sponsor project through GitHub Sponsors

[ThomasArdal]

Currently, there are multiple ways of sponsoring this project as I understand it. One could become a backer through Open Collective, a sponsor through Open Collective, or a sponsor of @brandonseydel through GitHub Sponsors. Maybe you should simplify this to only support one or two ways of sponsoring. The mention on the front page is nice and something that would appeal to companies. Tha will require Open Collective, though. And if a company already chose GitHub Sponsors as their sponsoring platform, this is not an option. Just some random thoughts here, so feel free to close this if you would like things to stay as they are.

[github-actions]

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