Story Style Tweaks

[cadie]

There are some style adjustments we could make for the Story post type that would help improve the spacing, readability and usage of classes throughout the stories:

• Headings in stories are adjusted to have a custom font face, size, and color in https://github.com/UCF/Pegasus-Theme/blob/master/versions/v6/functions.php#L35. The .h1, .h2, .h3, .h4, .h5, .h6, .display-1, .display-2, .display-3, .display-4 should be displayed the same/similarly to their respective heading/display tag, in order to discourage assigning text to headings and creating custom styles.
• Increase the margin/spacing above and below the image/image captions. The images are a little too close together and to other content as it is.
• Increase margin/spacing above headings. Headings throughout the story should have a little bit more breathing room in order to create a pause in reading.
• font-size-* classes should be relative to what the story's new font-size is, the current font-size with .font-size-sm applied is too small relative to the story text font size.