Improve padding across the site

[rachael-phillips]

There are many places across the site where the padding is off and the visual styling needs to be improved so that we reach a user experience that represents the PF brand as trustworthy.

Here are some examples:
The padding below and above the Color headers should be the same:

[rachael-phillips]

Get Started - Develop page:

[rachael-phillips]

Migration guide:

This needs more breathing room for readability:

[rachael-phillips]

Spacing on Card view under Usage and Behavior:

https://www.patternfly.org/v4/design-guidelines/usage-and-behavior/bulk-selection

Later on the page:

Bottom of page:

[rachael-phillips]

This is on page layout. The spacing should be uniform across other components.

[rachael-phillips]

The headers need to be uniform across all component pages:

This is an issue across demos, experimental, inline table, layouts, and virtual scroll

[rachael-phillips]

Spacing is off here in the paragraph text.

[rachael-phillips]

Props and CSS Variables Headers across the site: