Link to the RSS/atom feed from the versions page.

Author: isoos

app/lib/frontend/templates/package_versions.dart

@@ -58,7 +58,11 @@ String renderPkgVersionsPage(
     }
   }
 
-  final blocks = <d.Node>[];
+  final blocks = <d.Node>[
+    d.markdown(
+        'Looking to receive notifications when a new version is published? '
+        'Subscribe to the package\'s [versions feed](${urls.pkgFeedUrl(data.package.name!)}) with your feed reader.'),
+  ];
   if (stableVersionRows.isNotEmpty &&
       prereleaseVersionRows.isNotEmpty &&
       latestPrereleaseVersion != null) {

app/test/frontend/golden/pkg_versions_page.html

@@ -212,6 +212,11 @@ <h3 class="detail-lead-title">Metadata</h3>
             <div class="detail-container detail-body-main">
               <div class="detail-tabs-content">
                 <section class="tab-content detail-tab-versions-content -active">
+                  <p>
+                    Looking to receive notifications when a new version is published? Subscribe to the package's
+                    <a href="/api/packages/oxygen/feed.atom">versions feed</a>
+                    with your feed reader.
+                  </p>
                   <p>
                     The latest prerelease was
                     <a href="#prerelease">2.0.0-dev</a>

app/test/task/testdata/goldens/packages/oxygen/versions.html

@@ -204,6 +204,11 @@ <h3 class="detail-lead-title">Metadata</h3>
             <div class="detail-container detail-body-main">
               <div class="detail-tabs-content">
                 <section class="tab-content detail-tab-versions-content -active">
+                  <p>
+                    Looking to receive notifications when a new version is published? Subscribe to the package's
+                    <a href="/api/packages/oxygen/feed.atom">versions feed</a>
+                    with your feed reader.
+                  </p>
                   <h2 id="stable">Stable versions of oxygen</h2>
                   <table class="version-table" data-package="oxygen">
                     <thead>