Bulma v9 website (#3249)

* Add Bulma v9

* Add vendor dependencies

* Fix native

* Fix sponsors

* Add style attribute

docs/_sass/old/bootstrap.sass

@@ -0,0 +1,81 @@
+$bootstrap: #6f5499
+$bootstrap-invert: #fff
+
+.bd-bootstrap-table
+  margin: 3rem 0
+
+.bd-pros-heading
+  padding: 0 2rem
+  text-align: center
+
+.bd-pros-icon
+  margin-bottom: 3rem
+  text-align: center
+  svg
+    height: 3rem
+    width: auto
+
+.bd-pros-list
+  margin: 0 auto
+  max-width: 540px
+
+.bd-pro
+  .icon
+    position: relative
+    top: -1px
+  .title
+    margin-bottom: 0.5rem
+
+.bd-pro + .pro
+  margin-top: 2rem
+  padding-top: 2rem
+
+.bd-pro-content
+  p:not(:last-child)
+    margin-bottom: 0.5rem
+
+.bd-pro.bd-is-bulma
+  .icon
+    color: $primary
+
+.bd-pro.bd-is-bootstrap
+  .icon
+    color: $bootstrap
+
+.bd-bootstrap-comparison
+  margin: 0 auto
+  max-width: 42rem
+  .table
+    color: $red
+    thead,
+    tfoot
+      th
+        font-size: 1.5rem
+        text-align: center
+      svg
+        height: 1.5rem
+        margin-right: 1rem
+        position: relative
+        top: 0.25rem
+        width: auto
+    tbody
+      th
+        font-size: 1.25rem
+        text-align: center
+      td
+        font-family: $family-monospace
+        width: 50%
+      a
+        color: currentColor
+        &:hover
+          text-decoration: underline
+    .bd-is-empty
+      background-color: $background
+      color: $text-light
+    .bd-is-unique
+      background-color: rgba($green, 0.25)
+      color: $text-strong
+      font-weight: $weight-bold
+
+.bd-bootstrap-comparison-header
+  margin-bottom: 3rem