switch to scss for css, begin refactoring old css into scss, add bulma 0.9.1 to repo

viewer/static/bulma/sass/elements/notification.sass

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+$notification-background-color: $background !default
+$notification-code-background-color: $scheme-main !default
+$notification-radius: $radius !default
+$notification-padding: 1.25rem 2.5rem 1.25rem 1.5rem !default
+$notification-padding-ltr: 1.25rem 2.5rem 1.25rem 1.5rem !default
+$notification-padding-rtl: 1.25rem 1.5rem 1.25rem 2.5rem !default
+
+$notification-colors: $colors !default
+
+.notification
+  @extend %block
+  background-color: $notification-background-color
+  border-radius: $notification-radius
+  position: relative
+  +ltr
+    padding: $notification-padding-ltr
+  +rtl
+    padding: $notification-padding-rtl
+  a:not(.button):not(.dropdown-item)
+    color: currentColor
+    text-decoration: underline
+  strong
+    color: currentColor
+  code,
+  pre
+    background: $notification-code-background-color
+  pre code
+    background: transparent
+  & > .delete
+    +ltr-position(0.5rem)
+    position: absolute
+    top: 0.5rem
+  .title,
+  .subtitle,
+  .content
+    color: currentColor
+  // Colors
+  @each $name, $pair in $notification-colors
+    $color: nth($pair, 1)
+    $color-invert: nth($pair, 2)
+    &.is-#{$name}
+      background-color: $color
+      color: $color-invert
+      // If light and dark colors are provided
+      @if length($pair) >= 4
+        $color-light: nth($pair, 3)
+        $color-dark: nth($pair, 4)
+        &.is-light
+          background-color: $color-light
+          color: $color-dark