feat: legal (Impressum), contact, page template, and map shortcode

- page.html generic single-page template
- legal.md with slug=impressum to match live URL
- contact.md with practice info, hours, map embed
- map shortcode (iframe-based) usable from markdown
- Home template inlines the map iframe directly (shortcodes can't be called from templates)

templates/index.html

@@ -92,7 +92,16 @@
 {# Notfall block intentionally skipped — was `published: false` in Grav. #}
 
 {# ───────── Map ───────── #}
-{# Map shortcode added in Task 20; left as a placeholder comment here. #}
-{# {{ map() }} #}
+<section class="map-section">
+  <iframe
+    src="https://maps.google.com/maps?q=Kaiserstr.+23,+42329+Wuppertal&t=&z=15&ie=UTF8&iwloc=&output=embed"
+    width="100%"
+    height="450"
+    style="border:0"
+    loading="lazy"
+    referrerpolicy="no-referrer-when-downgrade"
+    title="Karte: Praxis am Lienhardplatz">
+  </iframe>
+</section>
 
 {% endblock %}

templates/page.html

@@ -0,0 +1,21 @@
+{% extends "base.html" %}
+
+{% block content %}
+
+<section class="single-page-title">
+  <div class="container text-center hidden-xs">
+    <h2>{{ page.title }}</h2>
+  </div>
+</section>
+
+<section class="ptb-100">
+  <div class="container">
+    <div class="row">
+      <div class="col-md-12">
+        {{ page.content | safe }}
+      </div>
+    </div>
+  </div>
+</section>
+
+{% endblock %}

templates/shortcodes/map.html

@@ -0,0 +1,11 @@
+<section class="map-section">
+  <iframe
+    src="https://maps.google.com/maps?q=Kaiserstr.+23,+42329+Wuppertal&t=&z=15&ie=UTF8&iwloc=&output=embed"
+    width="100%"
+    height="450"
+    style="border:0"
+    loading="lazy"
+    referrerpolicy="no-referrer-when-downgrade"
+    title="Karte: Praxis am Lienhardplatz">
+  </iframe>
+</section>