The actual navbar height is 3.5rem.

* Change it's to its.

* Fix links

* Fix typos

* Update ie10-viewport-bug-workaround.js year

* Update narrow-jumbotron copyright year to 2017

* Update carousel/index.html copyright year to 2017

* Update browsers-devices.md copyright year to 2017

* Update change-version.js copyright year to 2017

* Remove IE compatibility mode meta tag from docs, examples, and JS tests as we no longer support IE9 and IE8
* update and remove some IE bits from our supported browser page
* update introduction.md to match
* reword starter template intro

fixes #18115: move forward with one naming scheme for inversed color schemes, renaming .navbar-dark to .navbar-inverse (matching .card-inverse in the process and restoring v3's inverted class name)

update justified nav to use justified navbar; remove safari bug warning given flexbox implementation

- drop the table styles, use flex
- remove commented out code
- consolidate styles a bit
- add a huge flex-grow to the nav, making the assumption you want nav to take up most space