Integrate SDDS base theme button component with XB

Notes on the current state of Button:
- Doesn't open its link
- Greys out when any props are changed
- Icon props don't do anything

Thanks. Can you compare it against the subtheme button for the first two items? Also, check out some of the other components with icons as I think I tweaked some so they pull in the existing icons.

It would be good to do a side-by-side comparison with Storybook to see if it matches:

https://uikit.civictheme.io/

And ideally record the testing of all the props so we can see where the issues are to determine if the issues are on our end or on the XB end.

Here's an example with all the icons noted:

starshot_demo/components/01-atoms/button/button.component.yml