Examples updates (#24898)

* 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

1 files changed, 11 insertions, 0 deletions

diff --git a/docs/4.0/examples/checkout/form-validation.css b/docs/4.0/examples/checkout/form-validation.css
new file mode 100644
index 000000000..fd88d5a40
--- /dev/null
+++ b/docs/4.0/examples/checkout/form-validation.css
@@ -0,0 +1,11 @@
+.container {
+  max-width: 960px;
+}
+
+.border-top { border-top: 1px solid #e5e5e5; }
+.border-bottom { border-bottom: 1px solid #e5e5e5; }
+.border-top-gray { border-top-color: #adb5bd; }
+
+.box-shadow { box-shadow: 0 .25rem .75rem rgba(0, 0, 0, .05); }
+
+.lh-condensed { line-height: 1.25; }