adaugat lab3

Signed-off-by: hellisabove <robertnedela15@gmail.com>

lab3/templates/second.html

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+{% extends "_base.html" %}
+
+{% block title %}Second Page - Lab 03{% endblock %}
+
+{% block content %}
+<div class="content-box main-content">
+    <h1 class="main-title">Second Page</h1>
+    <p>
+        This is the second page of our Flask application.
+    </p>
+    <p>
+        Here you can see how Jinja2 template inheritance allows us to reuse the same layout across multiple pages.
+        The navbar, header, and sidebar are all defined in <code>_base.html</code>, while this content is unique to <code>second.html</code>.
+    </p>
+    <img src="/public/images/cats.jpeg" alt="Cats" class="img-fluid">
+</div>
+{% endblock %}