DOC Update news for 1.7.0 (scikit-learn#31492)

Author: jeremiedbb

doc/templates/index.html

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         <h4 class="sk-landing-call-header">News</h4>
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-          <li><strong>On-going development:</strong> <a href="https://scikit-learn.org/dev/whats_new/v1.7.html#version-1-7-0">scikit-learn 1.7 (Changelog)</a>.</li>
+          <li><strong>On-going development:</strong> <a href="https://scikit-learn.org/dev/whats_new/v1.8.html#version-1-8-0">scikit-learn 1.8 (Changelog)</a>.</li>
+          <li><strong>June 2025.</strong> scikit-learn 1.7.0 is available for download (<a href="whats_new/v1.7.html#version-1-7-0">Changelog</a>).</li>
           <li><strong>January 2025.</strong> scikit-learn 1.6.1 is available for download (<a href="whats_new/v1.6.html#version-1-6-1">Changelog</a>).</li>
           <li><strong>December 2024.</strong> scikit-learn 1.6.0 is available for download (<a href="whats_new/v1.6.html#version-1-6-0">Changelog</a>).</li>
           <li><strong>September 2024.</strong> scikit-learn 1.5.2 is available for download (<a href="whats_new/v1.5.html#version-1-5-2">Changelog</a>).</li>
           <li><strong>July 2024.</strong> scikit-learn 1.5.1 is available for download (<a href="whats_new/v1.5.html#version-1-5-1">Changelog</a>).</li>
           <li><strong>May 2024.</strong> scikit-learn 1.5.0 is available for download (<a href="whats_new/v1.5.html#version-1-5-0">Changelog</a>).</li>
-          <li><strong>April 2024.</strong> scikit-learn 1.4.2 is available for download (<a href="whats_new/v1.4.html#version-1-4-2">Changelog</a>).</li>
-          <li><strong>February 2024.</strong> scikit-learn 1.4.1.post1 is available for download (<a href="whats_new/v1.4.html#version-1-4-1-post1">Changelog</a>).</li>
-          <li><strong>January 2024.</strong> scikit-learn 1.4.0 is available for download (<a href="whats_new/v1.4.html#version-1-4-0">Changelog</a>).</li>
           <li><strong>All releases:</strong> <a href="https://scikit-learn.org/dev/whats_new.html"><strong>What's new</strong> (Changelog)</a>.</li>
         </ul>
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