extend button theme to allow for allowable prop customizations

[steppy452]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Button components allow custom variants, colors and sizes but theme does not fully support these customizations.

Issue Number: N/A

What is the new behavior?

This update allows

• custom variants to be included in the colors theme
• custom sizes to be themable
• adds storybook stories

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
reablocks-storybook	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 19, 2024 9:03pm

[netlify]

✅ Deploy Preview for reablocks-storybook ready!

Name	Link
🔨 Latest commit	30bc5cc
🔍 Latest deploy log	https://app.netlify.com/sites/reablocks-storybook/deploys/669ad4ac62dc4f000830f4e5
😎 Deploy Preview	https://deploy-preview-247--reablocks-storybook.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.