Prevent tabnapping exploit

According to https://www.freecodecamp.org/news/how-to-use-html-to-open-link-in-new-tab/, this piece of code prevents phishing attacks from stealing newly made tabs. While I don't feel like this change is critical for this website, it's better to be safe than sorry ;)

content/topics/cms.md

@@ -20,9 +20,9 @@ news_tag = "cms"
 <ul class="pkg-list">
   <li id="pkg-zola" class="pkg">
     <span class="pkg-name">zola</span>
-    <a class="pkg-link" target="_blank" title="homepage" href="https://www.getzola.org/"><i class="fa fa-home"></i></a>
-    <a class="pkg-link" target="_blank" title="documentation" href="https://www.getzola.org/documentation/getting-started/overview/"><i   class="fa fa-book"></i></a>
-    <a class="pkg-link" target="_blank" title="repository" href="https://github.com/getzola/zola"><i class="fa fa-code"></i></a>
+    <a class="pkg-link" target="_blank" rel="noopener noreferrer" title="homepage" href="https://www.getzola.org/"><i class="fa fa-home"></i></a>
+    <a class="pkg-link" target="_blank" rel="noopener noreferrer" title="documentation" href="https://www.getzola.org/documentation/getting-started/overview/"><i   class="fa fa-book"></i></a>
+    <a class="pkg-link" target="_blank" rel="noopener noreferrer" title="repository" href="https://github.com/getzola/zola"><i class="fa fa-code"></i></a>
     <p class="pkg-meta">
       <img src="https://img.shields.io/github/last-commit/getzola/zola.svg">
     </p>

templates/macros/package.html

@@ -8,20 +8,20 @@
 
   <div class="pkg-links">
     {% if pkg.id %}
-    <a class="pkg-link" target="_blank" title="crates.io link" href="https://crates.io/crates/{{pkg.id}}"><i class="fa fa-cube"></i></a>
+    <a class="pkg-link" target="_blank" rel="noopener noreferrer" title="crates.io link" href="https://crates.io/crates/{{pkg.id}}"><i class="fa fa-cube"></i></a>
     {% endif %}
 
     {% if pkg.homepage %}
-    <a class="pkg-link" target="_blank" title="homepage" href="{{pkg.homepage}}"><i class="fa fa-home"></i></a>
+    <a class="pkg-link" target="_blank" rel="noopener noreferrer" title="homepage" href="{{pkg.homepage}}"><i class="fa fa-home"></i></a>
     {% endif %}
 
 
     {% if pkg.documentation %}
-    <a class="pkg-link" target="_blank" title="documentation" href="{{pkg.documentation}}"><i class="fa fa-book"></i></a>
+    <a class="pkg-link" target="_blank" rel="noopener noreferrer" title="documentation" href="{{pkg.documentation}}"><i class="fa fa-book"></i></a>
     {% endif %}
 
     {% if pkg.repository %}
-    <a class="pkg-link" target="_blank" title="repository" href="{{pkg.repository}}"><i class="fa fa-code"></i></a>
+    <a class="pkg-link" target="_blank" rel="noopener noreferrer" title="repository" href="{{pkg.repository}}"><i class="fa fa-code"></i></a>
     {% endif %}
 
     <a class="pkg-link action" title="permalink" href="#pkg-{{pkg.id | default(value=pkg.name)}}"><i