v2.2 released, website updated

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I've just released v2.2 of acme-dns-tiny and updated texts on the project website.

For the website, I hope it will be easier to understand what the project is.

For the release v2.2, I wanted to just update continuous integration with my recent experience at job.

Finally, it contains too code style update, check that acme-dns-tiny is compatible with the ACME RFC 8555 released since v2.1, some bug fixes which were already merged but never added to a release and some fixes backported from the acme-tiny upstream project.