Text utils

[ameseee]

What does this PR do?

This PR adds some utils for text and adds them to sub-nav of Utils nav bar! The four categories are:

• font-weight
• text-align
• text-decoration
• text-transform

Where should the reviewer start?

• utils.html - what do you think about the order of all these sub-nav items?
• utils/text.scss - I made a separate docstring mixin to be used for text-transform so it's a bit more clear what those do (I think most folks would know, but just want to be as clear as possible!). I kept the each loop for weights since there are 5 and who knows, maybe one day we add more?
• utils-table.html template - I added some conditional logic to make sure the p tags are visible when we want, but not when we don't want. I'm not sure if that is the best way to go about it?
• Is it cool that these all live in same file? / are the comment labeling each section ok/helpful?
• Would you like me to add any categories of classes?

How should this be manually tested?

If you build the css docs and run, you'll see them on doc page and in the main.css file that is created!

Any background context you want to provide?

I mainly referenced Bootstrap as a guide for this, did not go in as much depth as them, but wanted to see what you thought of this as a start.

What are the relevant tickets?

https://3.basecamp.com/3494409/buckets/19192671/todos/3354455034

Screenshots (if appropriate)

Any other deploy steps?

[ameseee]

@tannerwelsh do you want a final look before I merge? Thank you again ☺️