City pages: keep "Read more →" from wrapping mid-phrase (#114)

The Wikipedia "Read more →" link in the notable-weather section could break
between "Read" and "more" at narrow widths. Join it with non-breaking spaces so
it stays on one line.

Claude-Session: https://claude.ai/code/session_01XXxmNFy9cZ6Gh8Y9thZn62

templates/city.html.j2

@@ -43,7 +43,7 @@
   {% if event %}
   <section class="city-event">
     <h2>Notable weather in {{ name }}</h2>
-    <p>{{ event.text }}{% if event.url %} <a href="{{ event.url }}" rel="nofollow">Read more →</a>{% endif %}</p>
+    <p>{{ event.text }}{% if event.url %} <a href="{{ event.url }}" rel="nofollow">Read&nbsp;more&nbsp;→</a>{% endif %}</p>
   </section>
   {% endif %}