chore: Add button component

[johnkuney]

Related to #973

Description

The buttons throughout the app were pretty disjointed. They relied on a series of classnames, applied at each instance which was just pretty messy and causing some inconsistencies.
Adding a reusable button component here to help with this.
It also handles the display of the loading state so that is more consistent, per #973

Note: I switched the order so the 'submit' buttons are on the right side of the create and edit forms. It seems more natural that way to me, but open leaving the order alone if you disagree

Test plan

Preview the site and check the buttons in the app look and perform well

[chedieck]

1. PayButton form margins have gone away with the changes.

Before:

After:

2. In the wallet, "Submit" is white on blue instead of the previous black on blue:

Before:

After:

3. "Create organization" button won't work when clicked, only if Enter is pressed.

4. Export as CSV lost white border:

Before:

After:

[johnkuney]

Cool good catches. I missed a few of those places, but got them in there now. And fixed the border and text color

[Klakurka]

The Organization Create button and sign in buttons don't seem to have the loading spinner when clicked.

[johnkuney]

ah yes, added