Add food logging functionality for users

Introduces a new FoodLogForm and a /log_food/<item_id> route to allow users to log food consumption. Updates the food item route to redirect to the log page, adds a log_food.html template, and updates the Bootstrap CDN version in base.html.

application/user/templates/log_food.html

@@ -0,0 +1,20 @@
+{% extends "base.html" %}
+
+{% block content %}
+<form method="POST">
+    {{ form.hidden_tag() }}
+
+    <div class="mb-3">
+        <div class="form-control-plaintext">
+            {{item_id}}
+        </div>
+    </div>
+
+    <div class="mb-3">
+        {{ form.amount.label(class="form-label") }}
+        {{ form.amount(class="form-control") }}
+    </div>
+
+    {{ form.submit(class="btn btn-primary") }}
+</form>
+{% endblock%}