Evaluate all button styles to ensure consistency

[johnthagen]

The following button styles are part of the The Combine

Grey Fill, Black Text

Blue Fill, White Text

Blue Outline, Blue Text

• (Sign up button, in [LangingPage] Add paragraph with call-to-action, sign-up button #1616 )

No Fill, Black Text

No Fill, Blue Text

Grey Fill, Red Text

[jasonleenaylor]

We want to make sure that our supported button styles are coming from the material theme.
Anything other than the following three styles should be considered unusual and probably changed.

1. Blue background button, Primary style (buttons we think you want to click)
2. Gray background button, Secondary style (buttons that are available, but not the primary action)
3. Red text button, Should be a custom style (buttons that you should press with caution, delete, archive, ect.)

When looking at this issue also consider moving custom styling in our re-usable button components into the theme.