Merge pull request #22196 from Parsifal-M/docs/update-plugin-page

Adds a friendly reminder to the plugin page around using caution on Open Source plugins.

microsite/src/pages/plugins/index.tsx

@@ -151,6 +151,12 @@ const Plugins = () => {
         {showOtherPlugins && (
           <div>
             <h2>All Plugins</h2>
+            <p>
+              Friendly reminder: While we love the variety and contributions of
+              our open source plugins, they haven't been fully vetted by the
+              core Backstage team. We encourage you to exercise caution and do
+              your due diligence before installing. Happy exploring!
+            </p>
             <div className="pluginsContainer margin-bottom--lg">
               {plugins.otherPlugins
                 .filter(