feat: Add static changelog page

Adds a new static page accessible at /changelog to display site updates and changes manually.

- Creates a new Flask Blueprint in `routes/changelog.py` to handle the route logic.
- Registers the `changelog_bp` blueprint in `app.py`.
- Creates the corresponding template `templates/changelog/changelog.html` extending the base layout.
- Adds a link to the Changelog page in the main sidebar navigation in `templates/base.html`, using an archive icon for consistency.
- Applies basic card styling to the changelog page content for improved visual structure.

templates/changelog/changelog.html

@@ -0,0 +1,35 @@
+{% extends "base.html" %}
+
+{% block content %}
+<div class="p-4 md:p-6"> {# Add some overall padding for the page content area #}
+    <div class="bg-white shadow-md rounded-lg p-6"> {# Card container #}
+        <h1 class="text-2xl font-semibold text-gray-900 mb-6 border-b pb-2">Changelog</h1> {# Added bottom border to
+        heading #}
+
+        {# Container for the actual changelog entries with prose styling #}
+        <div class="prose max-w-none">
+            <p>Updates and changes to the site will be documented here, with the most recent changes listed first.</p>
+
+            <!-- Example Entry Structure -->
+            <hr class="my-6"> {# Increased margin for HR #}
+            <h2 class="text-xl font-semibold mb-2">March 30, 2025</h2> {# Reduced margin-bottom for H2 #}
+            <ul class="list-disc pl-5 space-y-1"> {# Added space between list items #}
+                <li>Added the initial changelog page.</li>
+                <li>Fixed a minor styling issue on the dashboard.</li>
+                <li>Improved visual styling of the changelog page itself.</li> {# Added an entry for this change #}
+            </ul>
+
+            {# Add more entries below, following the pattern above #}
+            <!-- 
+            <hr class="my-6">
+            <h2 class="text-xl font-semibold mb-2">March 29, 2025</h2>
+            <ul class="list-disc pl-5 space-y-1">
+                <li>Implemented feature X.</li>
+                <li>Refactored component Y.</li>
+            </ul> 
+            -->
+
+        </div>
+    </div>
+</div>
+{% endblock %}