[openstreetmap/openstreetmap-website] Use database replicas for read requests (#2634)

[Andy Allan]

> Just need to wait for that.

In the meantime I've been testing against the 6-0-stable branch of rails, and it turns out that we make a surprising number of writes during GET requests! Way more than I expected. Some of these are reasonable (like updating the "message_read" when viewing messages, or the "needs_view" flag for user_blocks). Some are more dubious but not super important, like resending the registration confirmation email being via GET. Some are tricky, like how our signin system uses a GET request on a redirect to complete the signin process, or the magical mystical I-certainly-don't-understand-this rigmarole of creating tokens during OAuth GET requests. And then some I think can be definitely refactored, like the admin links to suspend or delete users all working via GET requests.

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