Support for kitties text sizing protocol to allow for variation in font size

[Velrok]

Is your feature request related to a problem? Please describe.

Having a larger font size for heading would hugely improve readability of documents.

Describe the solution you'd like

By adapting kitties text sizing protocol headings could stand out by having a larger font size.

Describe alternatives you've considered

Additional context

A few days ago the creator or kitty released support for variable font sizes.

[meowgorithm]

Hey! Thanks for the PR. I'm going to convert this to a discussion (for further discussion) until we decide it's something we plan on integrating. It's unlikely we'll support this in the short term, but it's a very interesting feature.