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License header

Add a license header in theme instead.

Anchor.js 1.0.0 drops the need to use anchor.css, so we remove it
from the codebase and move any leftover styles over to docs.css.

Closes #16488 by merging it.

Fixes #16470
Closes #16483

[Close #16482] Add border-radius to theme's navbar-inverse

[Close #16482] Add border-radius to theme's navbar-inverse

Document that nested tabs are not supported

Tweak temporal inputs

Redo jumbotron padding

- In general, there are very few instances that would require a jumbotron without a parent or child container.
- Right now we account for that behavior though with some horizontal padding on the .jumbotron class.
- This removes that horizontal padding as it narrows our grid classes unnecessarily and accounts for a super small use case.
- It also improves consistency across breakpoints, in that padding isn't being added and removed.
- In doing so, I also removed the shorthand padding property and went with the specific ones (because yay specificity).

Add Wall of Browser Bugs entries for #15998

Closes #15998
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Remove unnecessary style=flat from badges

Adds button styles to `.list-group-item`

Fixes Issue #16371 Carousel control is vertically off center

[Closes #16460] Fix .pagination-sm line height

[Closes #16447] Manually add license to bootstrap.less

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[Closes #16460] Fix .pagination-sm line height by adding `@line-height-small` to `.pagingation-sm`.

[Closes #16447] Concat. license to bootstrap.less

docs examples: input[placeholder]: "Enter email" => "Email"

For uniformity, as we don't seem to use this "Enter <X>" phrasing anywhere else.

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Closes #16372

Improvements to stateful button JS docs

Closes #16362.
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