Refactor case size template for improved readability and structure

templates/atlas/cases_by_size.html

@@ -1,11 +1,11 @@
 {% extends 'base.html' %}
 {% block content %}
-<h1>Cases by size</h1>
-<form method="get" class="mb-3">
+  <h1>Cases by size</h1>
+  <form method="get" class="mb-3">
     <label>Min size (bytes): <input type="number" name="min_size" value="{{ min_size }}" /></label>
     <button class="btn btn-primary btn-sm">Filter</button>
-</form>
-<table class="table table-sm">
+  </form>
+  <table class="table table-sm">
     <thead>
       <tr>
         <th>Case</th>
@@ -28,8 +28,8 @@
         <tr><td colspan="5">No cases</td></tr>
       {% endfor %}
     </tbody>
-</table>
-<nav>
+  </table>
+  <nav>
     <ul class="pagination">
       {% if page.has_previous %}
         <li class="page-item"><a class="page-link" href="?page={{ page.previous_page_number }}&min_size={{ min_size }}">Previous</a></li>
@@ -39,5 +39,5 @@
         <li class="page-item"><a class="page-link" href="?page={{ page.next_page_number }}&min_size={{ min_size }}">Next</a></li>
       {% endif %}
     </ul>
-</nav>
+  </nav>
 {% endblock %}