Remove custom errors page section from the guides
This pattern is too problematic and introduces a lot of edge cases: * On 4.2, the issue https://github.com/rails/rails/issues/15124 is back again. * needs to define each action for each http status otherwise the router raises ActionController::RoutingError (No route matches). * If the router has `match "/*username",...` and some action is missing, Rails will pick up the "match" and try to do its job. * encourages people to copy & paste programming. Not DRY. [ci skip]
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