Add heading level option to make it possible to add H1 to the pages

Problem/Motivation

There is no way to choose if the title will be displayed with h1, h2, etc. It's always a h2 tag.
For a good SEO, it would be good if we could select h1 on the Header banner.

Proposed resolution

Add a heading level select list field with the options: h1, h2, h3, h4, h5, h6
Render the hero banner using the selected heading level field.