[SergiuLupaiescu]

Fixes #5873.

The generated view templates used <h2> as the top-level heading on every page, leaving no <h1> in the document outline. This affects screen reader navigation.
Updated all 14 default and simple_form_for templates to use <h1>.

[aruprakshit]

Could the views use <h1> instead, with "Cancel my account" moving to <h2>? If that's too disruptive for apps that style the current markup, a config option would work too, e.g. config.heading_tag = :h1, defaulting to :h2 so nothing changes unless you opt in.

I agree with the reporter's suggestion to use a configuration approach. Predefining tags might be too restrictive for a broader audience, whereas configuration settings offer more flexibility.