Based on optional title passed in from parent element such as CodeExample or CodeTabs.
Darkens uncovered copy button slightly as recommended for a11y.
PR #16808
In the API docs there are occasions where we do not wish the code snippet
to have a copy button. This commit supports that by providing a new `hideCopy`
attribute.
- Add snackbar and pointer cursor for copy code button inside aio-code components
- Flex cenetered content in features page
- Removed duplicate global css class
- Add styles to links inside of sub-sections
- Remove focus outline on top nav bar links