Bulma v9 website (#3249)

* Add Bulma v9

* Add vendor dependencies

* Fix native

* Fix sponsors

* Add style attribute

docs/_sass/pages/bootstrap.scss

@@ -0,0 +1,136 @@
+$bootstrap: #6f5499;
+$bootstrap-invert: #fff;
+
+.bd-bootstrap-table {
+  margin: 3em 0;
+}
+
+.bd-pros-heading {
+  padding: 0 2em;
+  text-align: center;
+}
+
+.bd-pros-icon {
+  margin-bottom: 3em;
+  text-align: center;
+
+  svg {
+    height: 3em;
+    width: auto;
+  }
+}
+
+.bd-pros-list {
+  margin: 0 auto;
+  max-width: 540px;
+}
+
+.bd-pro {
+  .icon {
+    font-size: 1.25em;
+    height: 1.125em;
+    position: relative;
+    top: -1px;
+    width: 1.125em;
+  }
+
+  .title {
+    font-size: 1.25em;
+    margin-bottom: 0.5em;
+  }
+}
+
+.bd-pro + .bd-pro {
+  margin-top: 2em;
+  padding-top: 2em;
+}
+
+.bd-pro-content {
+  p:not(:last-child) {
+    margin-bottom: 0.5em;
+  }
+}
+
+.bd-pro.bd-is-bulma {
+  .icon {
+    color: $primary;
+  }
+}
+
+.bd-pro.bd-is-bootstrap {
+  .icon {
+    color: $bootstrap;
+  }
+}
+
+.bd-bootstrap-comparison {
+  margin: 0 auto;
+  max-width: 42em;
+
+  .table {
+    color: $red;
+
+    thead,
+    tfoot {
+      th {
+        font-size: 1.5em;
+        text-align: center;
+      }
+
+      svg {
+        height: 1.5em;
+        margin-right: 1em;
+        position: relative;
+        top: 0.25em;
+        width: auto;
+      }
+    }
+
+    tbody {
+      th {
+        font-size: 1.25em;
+        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: 3em;
+}
+
+@include desktop {
+  .bd-bootstrap-table {
+    font-size: 1.125rem;
+  }
+}
+
+@include widescreen {
+  .bd-bootstrap-table {
+    font-size: 1.25rem;
+  }
+}