Bulma v9 website (#3249)

* Add Bulma v9

* Add vendor dependencies

* Fix native

* Fix sponsors

* Add style attribute

docs/_sass/old/header.sass

@@ -0,0 +1,51 @@
+#github
+  color: $github
+  border-color: $github
+  &:hover
+    background: $github
+    border-color: $github
+    color: $scheme-main
+
+.bd-tw-button
+  background-color: $twitter
+  color: $scheme-main
+  border-color: transparent !important
+  &:hover
+    background-color: darken($twitter, 2.5%)
+    color: $scheme-main
+  &:active,
+  &:focus
+    background-color: darken($twitter, 5%)
+    color: $scheme-main
+
+#moreDropdown
+  .navbar-item
+    padding-left: 3em
+    position: relative
+  .icon
+    left: 1rem
+    position: absolute
+    text-align: center
+    top: 0.375rem
+    width: 1em
+
+#moreDropdownBootstrap
+  .icon
+    color: $bootstrap
+
+#moreDropdownPatreon
+  .icon
+    color: $patreon
+
++desktop
+  #blogDropdown
+    width: 17rem
+    .navbar-item
+      white-space: normal
+  #moreDropdown
+    width: 14rem
+    .navbar-item
+      padding-right: 1rem
+      white-space: normal
+      .level
+        flex-grow: 1