Add daily email export feed

source/daily.json.twig

@@ -0,0 +1,19 @@
+---
+permalink: /daily.json
+use: [daily_emails]
+---
+
+{
+  "emails": [
+    {% for email in data.daily_emails %}
+      {
+        "title": "{{ email.title|trim }}",
+        "date": "{{ email.date }}",
+        "permalink": "{{ email.permalink.relativeUrlPath }}",
+        "text": {{ email.blocks.content|replace({ '\n': '' })|json_encode|raw }},
+        "cta": "{{ email.cta }}",
+        "tags": [{% for tag in email.tags %}"{{ tag }}"{% if not loop.last %},{% endif %}{% endfor %}]
+      }{% if not loop.last %},{% endif %}
+    {% endfor %}
+  ]
+}