Fix holder.js links in examples

BS3 commits: 67594cb544e5b4b206558802318af4dbe77de1e0
move migration docs to new separate page, leave callout on getting started page; fixes 12244

BS3 commits: c32261221829f32c4ad808d1ccc1a2090a114bff
refactoring: add & use .text-emphasis-variant() mixin

BS3 commits: 9c9a2f3e08309145f86264687d267db347102cb7
add & use @modal-md Less var for uniformity

BS3 commits: b32d92ef716f08cf36c646a08a3e3215acf8db5f
Fixes 12263: Remove border radius when it's not both ends in panel

BS3 commits: 572e6a959aba6fa905c6377b900566b7ecc7c8f4
Fix typos, sentences in getting-started.html

BS3 commits: 10a158ff938781dd62440d88750db394d87143aa
refactoring: add & use .bg-variant() mixin

BS3 commits: 032869a439be4fcd6a28b3304648fb816d4275cf
Rename docs/LICENSE-DOCS to docs/LICENSE

BS3 commits: b790ea9011ca344c34cf02f3bba8d4a137ed1398
link to docs license

BS3 commits: e5d6ab9b31315b189670a9a58d65054c1df35401
Added WAI-ARIA roles to examples/theme/index.html (document, main)

BS3 commits: a73dacf4a074e2ec57851b82e75dfe40063b866d
Dustin' the docs: Typos, Grammar, etc. in css.html

BS3 commits: 3a1aa33860e444d2beac8c05e13de965f5d05a94
Fixes 12263: Remove border radius when it's not both ends in panel. Run grunt dist after adding 'a' requirement to the text emphasis classes. refactoring: add & use .bg-variant() mixin

BS3 commits: 572e6a959aba6fa905c6377b900566b7ecc7c8f4,
2115ac525b076f32003c28272703f4e279ab2f46,
032869a439be4fcd6a28b3304648fb816d4275cf
fix anomalous indentation

BS3 commits: 0be0090983d3582f1a1876f42218b62cd6f7120e
grammar: fix plural possessive

BS3 commits: 20772462df9c44a838c87c2e1b2dc89b9059e9e4