Add Bulma book

docs/_sass/book.sass

@@ -0,0 +1,59 @@
+$book-beige: #FFEDD7
+
+.bd-book-banner
+  background-color: $white
+  position: relative
+
+.bd-book-pattern
+  +overlay
+  background-image: url("/images/hab/lightpaperfibers_@2X.png")
+  background-repeat: repeat
+  background-size: 250px 150px
+  &::after
+    +overlay
+    background-color: rgba($book-beige, 0.1)
+    content: ""
+    display: block
+
+.bd-book-header
+  position: relative
+
+.bd-book-cover
+  img
+    display: block
+
+.bd-book-content
+  background-color: $white
+  box-shadow: 0 40px 40px -20px rgba($black, 0.1)
+  max-width: 520px
+  padding: 3rem
+
+.bd-book-description
+  max-width: 340px
+
+.bd-book-tags
+  margin-bottom: 3rem
+  .tags
+    .tag
+      margin-right: 1px
+
+.bd-book-columns
+  align-items: center
+  display: flex
+  justify-content: center
+  margin-left: auto
+  margin-right: auto
+  max-width: 1080px
+
++mobile
+  .bd-book-columns
+    flex-direction: column
+
++tablet
+  .bd-book-columns
+    justify-content: space-around
+  .bd-book-header
+    .tag
+      position: absolute
+      right: calc(100% + 1.25rem)
+      top: 0.5rem