Button guidance ✈️

[aubrey-oneal]

C4IP Button guidance

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• Can any part of this guidance be a pattern on Carbon?
• What does the usage tab looks like when info is pulled into this guidance? How long does it get?
• Can the addition of L2 (left-hand nav) help us?
• Is a full-page accordion an option to shorten this within the Gatsby constraint?
• [x] Exploration: IA

### Button
- [ ] https://github.com/carbon-design-system/carbon-website/issues/4236
- [ ] https://github.com/carbon-design-system/carbon-website/issues/4276
- [ ] https://github.com/carbon-design-system/carbon-website/issues/4315
- [ ] https://github.com/carbon-design-system/carbon-website/issues/4349
- [ ] https://github.com/carbon-design-system/carbon-website/issues/4350
- [ ] Raise a PR updating button guidance

### Button groups
- [ ] https://github.com/carbon-design-system/carbon-website/issues/4316
- [ ] https://github.com/carbon-design-system/carbon-website/issues/4334
- [ ] [Button guidance] Consolidate all the button information and do PR prep
- [ ] Raise a PR updating button groups guidance

### Menu buttons
- [ ] [Button guidance] Update and consolidate the menu buttons guidance
- [ ] Raise a PR updating menu buttons guidance

[sstrubberg]

REF https://github.com/carbon-design-system/carbon-website/issues/2672