install: open links in tab

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@@ -11,9 +11,7 @@ <h2>Currently released aptly version is <span class="text-danger">{{ .Params.ver
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     <h2>aptly installation</h2>
     <h3>Debian / Ubuntu</h3>
-    <p>aptly package is available in <a
-        href="https://packages.debian.org/search?searchon=names&keywords=aptly">Debian </a> as well as <a
-        href="http://packages.ubuntu.com/search?suite=all&searchon=names&keywords=aptly">Ubuntu</a>. </p>
+    <p>aptly package is available in <a href="https://packages.debian.org/search?searchon=names&keywords=aptly" target="_blank">Debian </a> as well as <a href="http://packages.ubuntu.com/search?suite=all&searchon=names&keywords=aptly" target="_blank">Ubuntu</a>. </p>
     <p>If you would like to install a upstream release of aptly with a different version than then Debian / Ubuntu package, aptly can be installed
       by adding a new repository to <code>/etc/apt/sources.list.d</code>:</p>
     <pre class="code">$ echo "deb [signed-by=/etc/apt/keyrings/aptly.asc] http://repo.aptly.info/ squeeze main" | sudo tee /etc/apt/sources.list.d/aptly.list</pre>