Add deletion fuinctionality to storages

shimatta_kenkyusho/templates/parts/modals/delete-storage-modal.html

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+<div class="modal fade" id="delete-storage-modal">
+    <div class="modal-dialog">
+        <div class="modal-content">
+            <div class="modal-header">
+                <h5 class="modal-title" id="staticBackdropLabel">Delete Storage</h5>
+                <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
+            </div>
+            <form action="" method="post">
+                {% csrf_token %}
+                <div class="modal-body">
+                    <h2>Do you want to delete this storage and possibly all of its substorages?</h2>
+                        {% if err_msgs %}
+                        {% for error in err_msgs %}
+                        <p class="text-danger text-center">{{ error }}</p>
+                        {% endfor %}
+                        {% endif %}
+                </div>
+                <div class="modal-footer">
+                    <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
+                    <input type="submit" class="btn btn-danger" value="Delete Storage" name="submit-delete-storage">
+                </div>
+            </form>
+        </div>
+    </div>
+</div>