Switch Twitter link to some Nitter instance #489
Merged
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This kind of reverts 3f1c43e, since now we'll know if that link goes down. Twitter cannot be used, since like that commit mentions, Twitter now blocks automation (thanks to a certain Elongated Muskrat), which includes mdbook-linkcheck.
The choice of Nitter instance is motivated by a few points. First, a list of instances is available from Nitter's GitHub wiki (https://github.com/zedeus/nitter/wiki/Instances).
The first parameter in the choice is the region; there are three (3) "anycast" instances, which may (1) reduce latency for readers of Pan Docs, and (2) reduce the load of Pan Docs' link-checking itself (by distributing across several servers behind the anycast). I think, anyway.
One of these instances is not updated, which is not a good sign for reliability either.
Then, it turns out several instances block HTTP HEAD requests like Twitter (but not GET, suggesting it is intentional); of the remaining two, only the chosen one doesn't.