Add dashboard widget to show the latest notes. Issue #51

p.s: I would like to be able to select a particular tag to show, but
none of the dashboard widgets are configurable.

I hate increasing the app size from 300k to almost 3 mb for something
so simple, but we must adapt to the majority and use vue here.

css/global.scss

@@ -0,0 +1,7 @@
+.icon-quicknotes {
+    @include icon-color('app', 'quicknotes', $color-black);
+}
+
+.icon-pinned {
+    @include icon-color('pinned', 'quicknotes', $color-black);
+}