Add robots meta tag to templates to make it less likely for a crawler to get stuck

templates/index.html

@@ -1,6 +1,8 @@
 {% extends "ip.html" %}
 {% import "helpers.html" as helper %}
 
+{% block robots_meta %}{# Allow indexing for landing page #}{% endblock %}
+
 {% block title %}Your IP: {{ data.result.address }}{% endblock %}
 {% block og_title %}What is my IP-Address?{% endblock %}
 {% block h1 %}Your IPv{% if data.result.ip_info.is_v6_address %}6{% else %}4{% endif %}: <code>{{ data.result.address }}</code>{% endblock %}