Fix use/main.md JSX comment and restore notices.md template

Same bug as ifb/main2.md — JSX comment syntax in a file without
components: true would render as visible text. Also restore the
EU notices.md alert templates that the Freiburg team uses for
posting maintenance banners.

Author: dannon

content/bare/eu/usegalaxy/notices.md

@@ -1 +1,32 @@
+<!--
 
+<div class="alert" style="background: #fc954e;">
+
+#### **Cluster Maintenance April 8 and 9**
+
+Starting from April 8th 2024, maintenance work will take place at our compute cluster, however our headnode servers are not affected. This means:
+<li> Our website will be reachable </li>
+<li> You can start jobs and workflows </li>
+<li> Jobs can remain in 'grey' state for several days </li>
+<li> You can not upload files </li>
+<li> Interactive tools will be aborted and you can not start new ones </li>
+The maintenance should be completed by April 10th and we will resume to normal operation then. Due to backlog in the job queue, job execution can take notably longer, please refrain from inquiries.
+</div>
+
+<div class="alert" style="background: #68d4ff;">
+
+#### **Global Climate Strike on September 15th 2023**
+
+The Freiburg Galaxy team will be striking on 15.09.2023. The job queue will be paused for a few hours on Friday. This means that you will still be able to visit our website, but new jobs will not start. Running jobs will remain unaffected. For more information, please see our [blog post](https://galaxyproject.org/news/2023-09-11-climate-strike/).
+
+</div>
+
+<div class="alert" style="background: #00d084;">
+
+#### **Act, don't criminalize!**
+
+Today, 21st of April 2023, a statement in support of peaceful, but resolved protest against insufficient climate politics got released and has been signed by more than 1000 scientists from German-speaking countries in Europe. Read [why members of the Freiburg, Germany branch of Galaxy Europe endorse this initiative](https://galaxyproject.org/news/2023-04-21-act-dont-criminalize/).
+
+</div>
+
+-->

content/use/main.md

@@ -9,7 +9,5 @@ This directory lists __platforms where you can use or deploy__ your own Galaxy S
 * *Almost all of them are open to everyone (Academic clouds are the exception).*
 * *All of the resources can be used, either immediately, or shortly after getting an account.*
 
-{/* -
-The rest of this page (the actual directories) are generated by
-layouts/use_index.pug
-- */}
+<!-- The rest of this page (the actual directories) are generated by
+layouts/use_index.pug -->