Renumber heading levels in Paste from Office

[gaddman]

📝 Provide a description of the improvement

The Paste from Office feature retains heading levels where configuration allows. However, accessibility guidelines mean the default heading levels start at <h2>. If such a config is applied pasting a Word or Google doc will be converted to a paragraph instead.

Ideally the heading levels should be shifted down a level on paste if <h1> is not in use.

Such a request was also suggested in this comment on #2443.

📃 Other details

Related issues:

• Why is h1 element not supported? #2443
• Handle h1 even if editor is configured to support h2+ #2455
• Handling h1 headers #2479
• Improve style retention on paste from MS Word #10577

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