Standard link collection to subscriptions

_includes/subscription_lists.md

+- Subscribe here to receive all further [**HIFIS newsletter**](https://lists.desy.de/sympa/subscribe/hifis-newsletter) issues automatically.
+- For more frequent updates, you are invited to regularly check our [**blog posts page**]({% link posts/index.html %}), and
+- Subscribe to <a class="rss-posts-button" href="{{ '/feed/news.xml' | relative_url }}"
+                       title="Subscribe to HIFIS Blog Posts RSS Feed (RSS Reader required)"
+                       type="application/atom+xml"
+                       download>
+                       <strong>HIFIS Blog Posts RSS Feed</strong>
+                    </a> (RSS Reader required)
+- Subscribe to [**AAI Announcement letter**](mailto:helmholtz-aai-announcement-subscribe@fz-juelich.de) /
+  [unsubscribe](mailto:helmholtz-aai-announcement-unsubscribe@fz-juelich.de)

_layouts/frontpage.html

@@ -77,6 +77,7 @@
                         </div>
                         <a href="{{ 'posts/' | relative_url }}" class="btn btn-outline-secondary">All Blog Posts</a>
                         <a href="{{ 'newsletter/' | relative_url }}" class="btn btn-outline-secondary">HIFIS Newsletter</a>
+                        <a href="{{ 'subscribe' | relative_url }}" class="btn btn-outline-secondary">Subscribe</a>
                             </div>
                         </div>
                 </section>

faq.md

@@ -70,11 +70,10 @@ At the same time, the significance of a sustainable software development for the
     </summary>
     <div>
         <p>Since July 2022, HIFIS is sending quarterly newsletters via <code class="language-plaintext highlighter-rouge">newsletter@hifis.net</code>. You are invited to register to never miss any news and upcoming events! Newsletters published so far can be <a href="{% link newsletter/index.md %}">found here</a>.</p>
-        <p>Either register <a href="mailto:sympa@desy.de?subject=sub%20hifis-newsletter">by sending a registration mail</a> or
-        <a href="https://lists.desy.de/sympa/subscribe/hifis-newsletter">register here</a>, where you can also unregister.</p>
-        <p>To stay updated on general HIFIS news, you are invited to check out
-        <a href="{{ site.feed.collections.posts.path | relative_url }}">our RSS news feed</a>—besides, of course, regularly checking our website and <a href="news">news section!</a></p>
     </div>
+<div markdown=1>
+{% include subscription_lists.md %}
+</div>
 </details>
 
 <details class="my-3">

newsletter/index.md

@@ -25,13 +25,6 @@ All previous newsletter issues can be found here.
 
 ## Subscribe and share the links:
 
-- Subscribe here to receive all further [**HIFIS newsletter**](https://lists.desy.de/sympa/subscribe/hifis-newsletter) issues automatically.
-- For more frequent updates, you are invited to regularly check our [**blog posts page**]({% link posts/index.html %}), and
-- Subscribe to <a class="rss-posts-button" href="{{ '/feed/news.xml' | relative_url }}"
-                       title="Subscribe to HIFIS Blog Posts RSS Feed (RSS Reader required)"
-                       type="application/atom+xml"
-                       download>
-                       <strong>HIFIS Blog Posts RSS Feed</strong>
-                    </a> (RSS Reader required)
+{% include subscription_lists.md %}
 
 Spread the word and share the links. Thank you!

subscribe.md

+---
+title: Subscribe to HIFIS lists
+title_image: default
+layout: default
+excerpt:
+    Subscribe to HIFIS lists.
+---
+
+<h3>Subscription links</h3>
+
+See here for links to HIFIS newsletter, posts and specific announcement letters:
+
+{% include subscription_lists.md %}
+
+Spread the word and share the links. Thank you!