docs: improve readme [skip ci]

source/plugins/tweets/README.md

@@ -4,8 +4,10 @@ The recent *tweets* plugin displays your latest tweets from your [Twitter](https
 
 <table>
   <td align="center">
-    <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.tweets.svg">
-    <details><summary>With tweets attachments version</summary>
+    <details open><summary>Latest tweets</summary>
+      <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.tweets.svg">
+    </details>
+    <details><summary>Latest tweets with attachments</summary>
       <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.tweets.attachments.svg">
     </details>
     <img width="900" height="1" alt="">