* fix cover nav

* Improve signin visuals and alignment with that flexbox love

* rewrite cover example in flexbox

* lighten signin bg

* first pass at pricing example

* redo examples index with data file

* tighten up spacing a bit

* update navbar descriptions

* link pricing

* move that back

* property order

* Fix test errors.

* Compress pricing.png.

* add form validation example

* remove that

* rename that

* restyle and space out

* fix errors

* change order

* cleanup album css and styles

* tweak examples index

* make it a badge

* options

* improve sticky footer alignment

* redesign example index

* brand new blog layout

* start new screenshots

* new product example page a la apple

* add email field

* fix linter, remove unused blog css

* hook up feather icons to start

* redo dashboard

* fix linting

* add floating labels example

* formatting

* formatting

* lint

* fix values on select

* optional input, plus input group

* new dashboard image

* start to reboot the offcanvas example

* updated images

* new offcanvas mostly implemented

* linting

* edit description

* more description changes

* - Add vertical margin to album hero buttons for when they're stacked
- Adjust font-size and padding for pricing header and hero
- Fix checkout's stacked column margins, plus update their check/radio
markup
- Update product's utilities to be responsive
- Made blog cards somewhat responsive (needs a bit more work tbh)

* drop leading zero

* more linting

* swap empty images for holder, fix border

* dist the docs

* navbars have no margin-bottom to begin

* add css var, tweak padding for mobile

* comment headers

* nix commented out code

* nix the navbar structure for a custom one, stack it on mobile

* tweak heading button group for mobile

* Removed narrow jumbotron and justified nav examples as these are easily accomplished with new components in v4

* improve card sizing on pricing

* update and compress

Includes simplifying the prose in `tables.md` and adding the bug to the list of browser bugs.

Closes https://github.com/twbs/bootstrap/issues/25166

Position: sticky is included in Edge 16

https://crbug.com/781344

- Drops the Team page for privacy and accuracy. I don't want to pressure folks into feeling committed to the project through a page like this, and it also doesn't allow folks any privacy option (as you can hide org membership on your GitHub profile).
- Moves the History page into an Overview page, which includes an updated history page and a quick team blurb at the top.
- Added redirects to the new Overview page from Team and History

* use a trailing slash when possible
* use https when possible
* remove a few redirected links
* consistently use `https://popper.js.org/`
* fix `iconUrl` in nuget files
* change Jekyll Windows guide to the official one

https://crbug.com/568691 has been succeeded by https://crbug.com/749848

Remove https://bugzilla.mozilla.org/show_bug.cgi?id=1282363
because CSSWG deemed Firefox's behavior to be the correct behavior per
https://github.com/w3c/csswg-drafts/issues/314

Replace it with a Chrome bug about changing Chrome to follow the spec & Firefox:
https://bugs.chromium.org/p/chromium/issues/detail?id=269061

* https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/817822/
* https://bugs.chromium.org/p/chromium/issues/detail?id=465274
* https://bugs.chromium.org/p/chromium/issues/detail?id=510079
* https://bugs.webkit.org/show_bug.cgi?id=158276

The transitioncancel event was shipped in Firefox 53 
https://bugzilla.mozilla.org/show_bug.cgi?id=1264125

The Japanese website (http://bootstrap4.jp/) doesn't exist therefore I removed the link to it.

- Moves the embed SCSS to the utilities subfolder
- Separate the floats from the embed docs
- Rename embed docs from responsive helpers to embeds

This generates a glyphicons.yml file from the glyphicons.less source,
and then components.html uses that data to generate the Glyphicons docs
by iterating through the data. The _data directory was introduced in
Jekyll 1.3.0, and GitHub Pages is already on [version 1.4.2][1].

Fixes #11862.

[1] https://github.com/github/pages-gem/blob/master/github-pages.gemspec#L16