Add integrations page.

[iphydf]

This change is 

[robinlinden]

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Reviewed 2 of 2 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[iphydf]

@SkyzohKey can you add those? The idea is that everybody who writes some integrations or clients can add them. Feel free to add yours to the list (make sure the list stays sorted).

[SkyzohKey]

Yeah, I'll add that asap :)