Navigation

Remove tabs on left, right, and bottom.
Tabs on the left and right, while occasionally useful, have been removed from our CSS.
You can still use the JavaScript plugin and custom CSS to make left/right tabs, but we will no longer include those in the core.
Removed parent <div> in the pagination component and dropped center and right alignment options. See #6562 for context.

See https://github.com/twbs/bootstrap/pull/6342 and https://github.com/twbs/bootstrap/commit/7a3f078fb487323246ccf64460b7efaf7d478afc