implemented also atom feed via template

web/planet-mars/templates/atom.xml

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+  <title>Planet TVL</title>
+  <link href="https::/planet.tvl.fyi"/>
+  <updated>{{now()|date(format="%Y-%m-%dT%H:%M:%SZ")}}</updated>
+  <id>https::/planet.tvl.fyi</id>
+  <generator uri="{{ PKG_HOMEPAGE }}" version="{{ PKG_VERSION }}">
+    {{ PKG_NAME }} by {{ PKG_AUTHORS }}
+  </generator>
+  <icon>https://planet.tvl.fyi/logo.svg</icon>
+
+  {% for entry in entries %}
+    <entry>
+      <id>{{ entry.id }}/planet.tvl.fyi</id>
+      {% if entry.title -%}
+        <title>{{ entry.title.content }}</title>
+      {% endif -%}
+      {% for link in entry.links %}
+        <link href="{{ link.href }}" {% if link.rel %}rel="{{ link.rel }}"{% endif %}/>
+      {% endfor %}
+      {% if entry.updated %}
+        <updated>{{ entry.updated }}</updated>
+      {% endif %}
+      {% if entry.published %}
+        <published>{{ entry.published }}</published>
+      {% endif %}
+      {% if entry.summary -%}
+        <summary>
+          {{ entry.summary.content|escape }}
+        </summary>
+      {% endif -%}
+      {% for author in entry.authors %}
+        <author>
+          {% if author.name -%}
+            <name>{{ author.name }}</name>
+          {% endif -%}
+          {% if author.email -%}
+            <email>{{ author.email }}</email>
+          {% endif -%}
+        </author>
+        {% if author.email -%}
+          <uri>{{ author.uri }}</uri>
+        {% endif -%}
+      {% endfor %}
+      {% if entry.content -%}
+        <content {% if entry.content.type %}type="{{ entry.content.type }}"{% endif %} {% if entry.content.src %}type="{{ entry.content.src }}"{% endif %}>
+          {{ entry.content.body|escape }}
+        </content>
+      {% endif -%}
+    </entry>
+  {% endfor %}
+</feed>