Give theme.json elements the same name as the HMTL element (if exist)

[huubl]

Give Gutenberg theme.json elements the same name as the HMTL element (if exist).

Why?

• The theme.json caption element is referencing to the HTML element figcaption. This is confusing, because there is a HTML caption element that can be used in tables.
• I think it's best to stay as close to existing standards as possible.
• People editing the theme.json directly are most likely familiar with HTML tags. So they know <a> is a link element. But someone new to Gutenberg may not know that 'link' must be used to target the <a> tag.
• Plus: why not use the HTML-elements naming? Since more human readable names can be used in the editor, e.g. h1 > Heading 1

If the 'link' element is to remain, I would suggest adding this as an alias to the (to be added) theme.json 'a' element.

Gutenberg element	HTML element	Is same
link	a	❌
heading	non existing	✔️
h1	h1	✅
h2	h2	✅
h3	h3	✅
h4	h4	✅
h5	h5	✅
h6	h6	✅
button	button	✅
caption	figcaption	❌
cite	cite	✅