PF6 Design guideline updates

[andrew-ronaldson]

This Epic captures the updates required for the PFv6 updates. Most of this work will be updating screenshots but there are also some documented CSS variables.

Component guideline updates

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1. Guideline updates: About modal
2. Guideline updates: Accordions
3. Guideline updates: Action list
4. Guideline updates: Alert
5. Guideline updates: Avatar
6. Guideline updates: Banner
7. Guideline updates: Breadcrumb
8. Guideline updates: Buttons
9. Guideline updates: Cards & Tiles
10. Guideline updates: Copy clipboard
11. Guideline updates: Code block & Code editor
12. Guideline updates: List, Simple list, Data list & Decription list
13. Guideline updates: Calendar month
14. Guideline updates: Divider
15. Guideline updates: Drag and drop
16. Guideline updates: Drawer
17. Guideline updates: Dual list selector
18. Guideline updates: Empty state
19. Guideline updates: Expandable section
20. Guideline updates: File uploads
21. Guideline updates: Form elements
22. Guideline updates: Hint
23. Guideline updates: Inline edit
24. Guideline updates: Input group & Text input groups
25. Guideline updates: Jump links
26. Guideline updates: Label
27. Guideline updates: Login page
28. Guideline updates: Masthead
29. Guideline updates: Menu, Select, dropdown & Menu toggle
30. Guideline updates: Modal
31. Guideline updates: Navigation
32. Guideline updates: Notification badge (stateful button) & Notification drawer
33. Guideline updates: Number inputs
34. Guideline updates: Overflow menu
35. Guideline updates: Page
36. Guideline updates: Pagination
37. Guideline updates: Panel
38. Guideline updates: Password strength
39. Guideline updates: Popover & Tooltips
40. Guideline updates: Progress & Progress stepper
41. Guideline updates: Search input
42. Guideline updates: Sidebar
43. Guideline updates: Slider
44. Guideline updates: Table
45. Guideline updates: Tabs
46. Guideline updates: Timestamp
47. Guideline updates: Toggle group
48. Guideline updates: Toolbar
49. Guideline updates: Treeview
50. Guideline updates: Truncate
51. Guideline updates: Wizard

[edonehoo]

Note: this will also close #4076 (or we could close that one in favor of this more detailed epic)