feat: contact page template reads address/hours from config

Moves hardcoded address, phone/fax/email, and Sprechzeiten table out of
content/contact.md into a dedicated contact.html template that renders
them from config.extra — sharing a single source of truth with the footer.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

templates/contact.html

@@ -0,0 +1,43 @@
+{% extends "base.html" %}
+{% import "macros/page_title.html" as pt %}
+
+{% block content %}
+
+{{ pt::page_title(title=page.title) }}
+
+<section class="ptb-100">
+  <div class="container">
+
+    <h2>{{ config.extra.practice_name }}</h2>
+
+    <p>
+      <strong>Hausärztliche Gemeinschaftspraxis</strong><br>
+      {{ config.extra.address_street }}<br>
+      {{ config.extra.address_zip_city }}
+    </p>
+
+    <p>
+      <strong>Telefon:</strong> {{ config.extra.phone }}<br>
+      <strong>Telefax:</strong> {{ config.extra.fax }}<br>
+      <strong>E-Mail:</strong> <a href="mailto:{{ config.extra.email }}">{{ config.extra.email }}</a>
+    </p>
+
+    <h2>Sprechzeiten</h2>
+
+    <table class="tg">
+      {% for h in config.extra.opening_hours %}
+        <tr>
+          <td>{{ h.label }}</td>
+          <td>{{ h.time }}&nbsp;Uhr</td>
+        </tr>
+      {% endfor %}
+    </table>
+
+    <br>
+
+    {{ page.content | safe }}
+
+  </div>
+</section>
+
+{% endblock %}