Adds sup and sub to titles and subtitles

[SimplyThomas]

This is a new improvement.

Proposed solution

This PR fixes sizing when using either <sub> and <sup> elements inside a .title element.

Testing Done

Compiled with yarn and tested across all of the various sizes and configurations.

Before:

After:

[jgthms]

I’d rather keep it consistent with the .content sup and sub who have a font size of 75%.

[SimplyThomas]

@jgthms this is also a better implementation. Tested in the same way as before, cycling through the various sizes. Also verified that the variables work as intended.

[jgthms]

Why does it appear twice? Just add it to the first rule set.

[SimplyThomas]

@jgthms One's for .title, the other is for .subtitle

[jgthms]

I’m not sure we would want a different size for both title and subtitle since they can both be all sizes from 1 to 7 anyway.

[SimplyThomas]

@jgthms I have updated it to reflect just one size.