Fix: Open footer links in new tab for HA ingress compatibility (#549)

Add target="_blank" to Apache license and GitHub repo links in the
footer so they open in a new tab instead of within the Home Assistant
ingress iframe. Also upgrade the Apache license URL from HTTP to HTTPS.

Author: steynovich

dao/webserver/app/templates/base.html

@@ -65,8 +65,8 @@
     {% block content %}{% endblock %}
     </div>
   <footer>
-      <span style="float:right;"><a href="http://www.apache.org/licenses/LICENSE-2.0">&nbsp&copy;&nbsp{{ version[0:4] }}: Apache 2.0</a></span>
-      <span>&nbsp <a href="https://github.com/corneel27/day-ahead">Day Ahead Optimizer version: {{ version }}</a></span>&nbsp
+      <span style="float:right;"><a href="https://www.apache.org/licenses/LICENSE-2.0" target="_blank">&nbsp&copy;&nbsp{{ version[0:4] }}: Apache 2.0</a></span>
+      <span>&nbsp <a href="https://github.com/corneel27/day-ahead" target="_blank">Day Ahead Optimizer version: {{ version }}</a></span>&nbsp
   </footer>
 </div>
 </body>