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v4 Travis Build

sets up infra to properly build Bootstrap

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Fixes the _image mixing by prefixing the parameters with $

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Explicitly document existing de facto policy of supporting ESR Firefox

Document that dropdowns are intentionally click-based rather than hover-based

fix footer links to proper pages

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Replace docs reference to iconography

PropertySortOrder

And link to a relevant blog post w/ more info.
Refs #16966
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Fix anchors, fix naming consistency

Properties should be ordered border-top, border-bottom

Replace remaining instances of defunct .visible* classes in docs

.visible-xs(-block) => .hidden-sm-up

Fixes #17263.
[skip sauce]

Refs #17237
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Fix accidental triple colon from :before to ::before conversion

Fix #17288 — Sorry about that!

Use double colons for psuedo elements

Fix #17052

I found non working anchors and some naming in consistency. I hope I fixed well. Have a nice day.