Bookmark folders

Changes

• Display bookmarks from specified folders
• Create, update, delete bookmark folders
• Allow setting folder for a bookmark

Implements pleroma!4080 (merged), fixes #1335 (closed).

src/components/bookmark_folder_card/bookmark_folder_card.js

+import { library } from '@fortawesome/fontawesome-svg-core'
+import {
+  faEllipsisH
+} from '@fortawesome/free-solid-svg-icons'
+
+library.add(
+  faEllipsisH
+)
+
+const BookmarkFolderCard = {
+  props: [
+    'folder',
+    'allBookmarks'
+  ],
+  computed: {
+    firstLetter () {
+      return this.folder ? this.folder.name[0] : null
+    }
+  }
+}
+
+export default BookmarkFolderCard