Add bundles for organizing bookmarks (#1097)

* add bundle model and query logic

* cleanup tests

* add basic form

* add success message

* Add form tests

* Add bundle list view

* fix edit view

* Add remove button

* Add basic preview logic

* Make pagination use absolute URLs

* Hide bookmark edits when rendering preview

* Render bookmark list in preview

* Reorder bundles

* Show bundles in bookmark view

* Make bookmark search respect selected bundle

* UI tweaks

* Fix bookmark scope

* Improve bundle preview

* Skip preview if form is submitted

* Show correct preview after invalid form submission

* Add option to hide bundles

* Merge new migrations

* Add tests for bundle menu

* Improve check for preview being removed

bookmarks/templates/bundles/edit.html

@@ -0,0 +1,33 @@
+{% extends 'bookmarks/layout.html' %}
+{% load widget_tweaks %}
+
+{% block head %}
+  {% with page_title="Edit bundle - Linkding" %}
+    {{ block.super }}
+  {% endwith %}
+{% endblock %}
+
+{% block content %}
+  <div class="bundles-editor-page grid columns-md-1">
+    <main aria-labelledby="main-heading">
+      <div class="section-header">
+        <h1 id="main-heading">Edit bundle</h1>
+      </div>
+
+      {% include 'shared/messages.html' %}
+
+      <form id="bundle-form" action="{% url 'linkding:bundles.edit' bundle.id %}" method="post" novalidate>
+        {% csrf_token %}
+        {% include 'bundles/form.html' %}
+      </form>
+    </main>
+
+    <aside class="col-2" aria-labelledby="preview-heading">
+      <div class="section-header">
+        <h2 id="preview-heading">Preview</h2>
+      </div>
+
+      {% include 'bundles/preview.html' %}
+    </aside>
+  </div>
+{% endblock %}