Add a section on how to identify a pleroma instance, clarify that post upload limit is not capped too

Remove a limit on attachments in Mastodon API and document the changes in responses from vanilla mastodon

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helps differenciate between Electrons and others like Brutaldon.
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users to enable both strip and auto-orient

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* federation (ap, salmon)
* media (rich media, media proxy)
* upload (uploader proxy)

Each "part" will stop fighting others ones -- a huge federation outbound
could before make the media proxy fail to checkout a connection in time.

splitted media and uploaded media for the good reason than an upload
pool will have all connections to the same host (the uploader upstream).
it also has a longer default retention period for connections.

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Thanks @href!