Add bookmark details view (#665)

* Experiment with bookmark details

* Add basic tests

* Refactor details into modal

* Implement edit and delete button

* Remove slide down animation

* Add fallback details view

* Add status actions

* Improve dark theme

* Improve return URLs

* Make bookmark details sharable

* Fix E2E tests

bookmarks/styles/markdown.scss

@@ -0,0 +1,40 @@
+.markdown {
+  p, ul, ol, pre, blockquote {
+    margin: 0 0 $unit-2 0;
+  }
+
+  > *:first-child {
+    margin-top: 0;
+  }
+
+  > *:last-child {
+    margin-bottom: 0;
+  }
+
+  ul, ol {
+    margin-left: $unit-4;
+  }
+
+  ul li, ol li {
+    margin-top: $unit-1;
+  }
+
+  pre {
+    padding: $unit-1 $unit-2;
+    background-color: $code-bg-color;
+    border-radius: $unit-1;
+    overflow-x: auto;
+  }
+
+  pre code {
+    background: none;
+    box-shadow: none;
+    padding: 0;
+  }
+
+  > pre:first-child:last-child {
+    padding: 0;
+    background: none;
+    border-radius: 0;
+  }
+}