Phase 1: Windows HC Fixes #4517

Complete fixes outlined by audit to components in Windows HC mode.

• Accordion - Outline & expand/collapse icons missing for menu items (which makes it hard for users to tell it is an expandable accordion) - Fixed in USWDS - Accordion: Windows High Contrast Mode #4521
• Banner - Chevron missing (without those, users cannot tell they can expand the banner for more information) - Resolved in USWDS: Banner - WHC fix #4529
• Checkbox - Checkboxes do not show in high contrast mode - Fixed in USWDS: Radio Button & Checkbox - Windows High Contrast Support #4509
• Header - Fixed in USWDS - Header: Enable chevrons and add/remove icons to be visible in WHC/Forced Colors mode. Resolves #4453 #4485
• Radio Buttons - Radio buttons are invisible and do not show which is selected. - Fixed in USWDS: Radio Button & Checkbox - Windows High Contrast Support #4509
• Range Slider - Slider handle missing an outline and becomes negative space in between the range bar - Fixed in USWDS: Range Slider - Fixes high contrast visibility #4510
• Pagination - Selected page should have a bold border or different color background. In high contrast it isn't possible to see what page the user is currently on. - Fixed in USWDS - Pagination: Added stylings for Windows High Contrast mode #4523
• Footer - Social media icons missing. Chevron icon missing from mobile view - Resolved in USWDS - Footer: Added styling for WHC Mode #4528