Add missing docs to fiftyfifty

[chrisvxd]

Full API

• title (string) Title text
• subtitle (string?) Subtitle text
• footer (string) Footer text
• split (straight | diagonal | diagonal-reverse, default straight) Style of split between content and image
• logo (string?) URL for the logo image
• imageUrl (string?) URL for the background image
• unsplashId (string?) Unsplash ID for the background image
• unsplashKeywords (string?) Unsplash keywords to use for the background image
• googleFont (string?) Name for Google font to load
• fontFamily (string?, default '"Lato", "Helvetica Neue", sans-serif') Font family

[transitive-bullshit]

Are all of these going to have docs?

I feel like they should have inline docs in the template itself so when you're using the visual editor you just see them inline. This seems quicker & more direct than having a separate way of documenting themes.