Add introduction text to the daily email archive

...page

source/_includes/macros.html.twig

@@ -1,3 +1,8 @@
-{% macro yearsExperience() %}
-  {{- today|date('Y') - 2007 -}}
+{# Return a rounded count of daily emails I've sent (e.g. the actual number is 449, return 440+). #}
+{% macro dailiesCount(dailies) %}
+    {{- dailies|length|round(-1, 'floor') -}}+
+{% endmacro %}
+
+{% macro yearsExperience() %}
+    {{- today|date('Y') - 2007 -}}
 {% endmacro %}

source/_pages/archive.html

@@ -9,7 +9,11 @@ use:
 ---
 
 {% block content %}
-  <div class="space-y-16">
+  {% import 'macros' as macros %}
+
+  <p>This is an archive of the {{ macros.dailiesCount(data.daily_emails) }} email messages I have sent to <a href="/daily">my daily mailing list</a> since the 12th of August, 2022. Enjoy!</p>
+
+  <div class="mt-6 space-y-16">
     <div>
       <ul>
         {% for email in page.pagination.items %}