Fix/book 115 hidden focus indicators
* added focus ring to "how it works" text and close button in modal
* fix(BOOK-115): added focus ring to Hotel Sidepeek close button
* fix(BOOK-115): enabled selecting ancillaries with keyboard nav
* fix(BOOK-115): added focus indicator to "View and print receipt" in Manage Stay
* fix(BOOK-105 & BOOK-115): combined the two radio groups in payment selection to one, fixes focus indicator issue
* fix(BOOK-115): added focus indicator to shortcut links
* fix(BOOK-115): updated ancillaries keyboard selection
* fix(BOOK-115): removed tabIndex from Link component
* fix(BOOK-115): fixed single payment radio button not focusable
* fix(BOOK-115): updated to onKeyDown
* added id to "credit card"
* removed toUpperCase() on lables
* removed brackets
* moved the focus indicator to the DS Button component
* removed !important from ButtonLink css
* changed <label> to <fieldset> and <legend> and added aria-label to PaymentOptionGroup
* removed css class from sidepeek that was previously removed
* reverted changes and synced Guarantee radiogroup with Payment radiogroup to use same semantics
* removed duplicate label
* removed old sub heading
Approved-by: Erik Tiekstra
