Resolve header and nav accessibility violations

- Add aria-label to nav sections in app-header and app-nav to meet
accessibility guidelines. When application has multiple nav elements
an aria-label is required to help screen readers identify the elements
- Remove b-nav child of b-nav-bar in app-header to fix invalid markup
generated by Bootstrap-vue components. Components were not used as
expected by the component library
- Replace b-nav-item with HTML <li> elements using nav-item css classes
in order to use button elements. Bootstrap-vue generates <a> elements
which is not the semantic HTML element to use for items that are not
links to other sections of the application.
- Removed aria-expanded and nav-open class from nav-trigger button
- Update appHeader unit test

Used a TDD approach to write all tests to fail and then updated the
methods and actions to make the tests suceed. Each test resulting in
a dispatched action should be called once only and with the expected
action.

Signed-off-by: Derick Montague <derick.montague@ibm.com>
Change-Id: I18af3727708526f814b7ceb77a0c28fda9f3d9bd

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