Modernise the download page

This page was last touched in 2018 and still carried the ASF mirror-selection
form. The mirror network was retired in favour of a single CDN, so that form
now renders a "choose a mirror" dropdown offering exactly one entry,
dlcdn.apache.org. The checksum, signature and KEYS links still pointed at
www.apache.org/dist, which has been a 301 to downloads.apache.org for years.

The page now matches the form the rest of the Maven estate already uses,
finishing for this repository the sweep started in 2023:

  - the artifact from dlcdn.apache.org
  - the .sha512, .asc and KEYS from downloads.apache.org
  - older releases from archive.apache.org

Two things go with the mirror section, both worth a reviewer's attention:

  - its in-page anchors, #mirror and the version-numbered subsection anchor,
    which becomes the stable #Files. In-page only; no URL changes.
  - the paragraph linking to /guides/mini/guide-mirror-settings.html. That
    page is still live, but it is advice about configuring a repository
    mirror in settings.xml rather than about downloading a source release,
    and none of the ~43 repositories already on the current form carry it.
    Dropping it is what converges this page with the rest of the estate; say
    so on the PR if you would rather keep it here.

download.cgi is left in place. The ASF licence header is left exactly as it
was.

Generated-by: Claude Opus 5 (1M context)
diff --git a/src/site/xdoc/download.xml.vm b/src/site/xdoc/download.xml.vm
index 3f71035..1d482d3 100644
--- a/src/site/xdoc/download.xml.vm
+++ b/src/site/xdoc/download.xml.vm
@@ -23,104 +23,52 @@
   <properties>
     <title>Download ${project.name} Source</title>
   </properties>
+
   <body>
     <section name="Download ${project.name} ${project.version} Source">
 
-      <p>${project.name} ${project.version} is distributed in source format. Use a source archive if you intend to build
-      ${project.name} yourself. Otherwise, simply use the ready-made binary artifacts from central repository.</p>
+      <p><strong>${project.name} ${project.version}</strong> is distributed in source format.</p>
 
-      <p>You will be prompted for a mirror - if the file is not found on yours, please be patient, as it may take 24
-      hours to reach all mirrors.<p/>
+      <p>Use a source archive if you intend to build <strong>${project.name}</strong> yourself.</p>
 
-      <p>In order to guard against corrupted downloads/installations, it is highly recommended to
-      <a href="http://www.apache.org/dev/release-signing#verifying-signature">verify the signature</a>
-      of the release bundles against the public <a href="https://www.apache.org/dist/maven/KEYS">KEYS</a> used by the Apache Maven
-      developers.</p>
+      <p>Otherwise, simply use the ready-made binary artifacts from <strong>central repository</strong>.</p>
 
-      <p>${project.name} is distributed under the <a href="http://www.apache.org/licenses/">Apache License, version 2.0</a>.</p>
+      <p><strong>${project.name}</strong> is distributed under the <a href="https://www.apache.org/licenses/">Apache License, version 2.0</a>.</p>
 
-      <p></p>We <b>strongly</b> encourage our users to configure a Maven repository mirror closer to their location, please read <a href="/guides/mini/guide-mirror-settings.html">How to Use Mirrors for Repositories</a>.</p>
+      <subsection name="Files">
 
-      <a name="mirror"/>
-      <subsection name="Mirror">
+        <p>This is the current stable version of <strong>${project.name}</strong>.</p>
 
-        <p>
-          [if-any logo]
-          <a href="[link]">
-            <img align="right" src="[logo]" border="0"
-                 alt="logo"/>
-          </a>
-          [end]
-          The currently selected mirror is
-          <b>[preferred]</b>.
-          If you encounter a problem with this mirror,
-          please select another mirror.
-          If all mirrors are failing, there are
-          <i>backup</i>
-          mirrors
-          (at the end of the mirrors list) that should be available.
+        <table>
+          <thead>
+            <tr>
+              <th></th>
+              <th>Link</th>
+              <th>Checksum</th>
+              <th>Signature</th>
+            </tr>
+          </thead>
+          <tbody>
+            <tr>
+              <td>${project.name} ${project.version} (Source zip)</td>
+              <td><a href="https://dlcdn.apache.org/maven/plugins/${project.artifactId}-${project.version}-source-release.zip">${project.artifactId}-${project.version}-source-release.zip</a></td>
+              <td><a href="https://downloads.apache.org/maven/plugins/${project.artifactId}-${project.version}-source-release.zip.sha512">${project.artifactId}-${project.version}-source-release.zip.sha512</a></td>
+              <td><a href="https://downloads.apache.org/maven/plugins/${project.artifactId}-${project.version}-source-release.zip.asc">${project.artifactId}-${project.version}-source-release.zip.asc</a></td>
+            </tr>
+          </tbody>
+        </table>
+
+        <p>It is essential that you <a href="https://www.apache.org/info/verification.html">verify the integrity</a> of the downloaded file
+          using the checksum (.sha512 file)
+          or using the signature (.asc file) against the public <a href="https://downloads.apache.org/maven/KEYS">KEYS</a> used by the Apache Maven developers.
         </p>
 
-        <form action="[location]" method="get" id="SelectMirror">
-          Other mirrors:
-          <select name="Preferred">
-            [if-any http]
-            [for http]
-            <option value="[http]">[http]</option>
-            [end]
-            [end]
-            [if-any ftp]
-            [for ftp]
-            <option value="[ftp]">[ftp]</option>
-            [end]
-            [end]
-            [if-any backup]
-            [for backup]
-            <option value="[backup]">[backup] (backup)</option>
-            [end]
-            [end]
-          </select>
-          <input type="submit" value="Change"/>
-        </form>
-
-        <p>
-          You may also consult the
-          <a href="http://www.apache.org/mirrors/">complete list of
-            mirrors.</a>
-        </p>
-
-      </subsection>
-      
-      <subsection name="${project.name} ${project.version}">
-        
-      <p>This is the current stable version of ${project.name}.</p>
-        
-      <table>
-        <thead>
-          <tr>
-            <th></th>
-            <th>Link</th>
-            <th>Checksum</th>
-            <th>Signature</th>
-          </tr>
-        </thead>
-        <tbody>
-          <tr>
-            <td>${project.name} ${project.version} (Source zip)</td>
-            <td><a href="[preferred]maven/plugins/${project.artifactId}-${project.version}-source-release.zip">maven/plugins/${project.artifactId}-${project.version}-source-release.zip</a></td>
-            <td><a href="https://www.apache.org/dist/maven/plugins/${project.artifactId}-${project.version}-source-release.zip.sha512">maven/plugins/${project.artifactId}-${project.version}-source-release.zip.sha512</a></td>
-            <td><a href="https://www.apache.org/dist/maven/plugins/${project.artifactId}-${project.version}-source-release.zip.asc">maven/plugins/${project.artifactId}-${project.version}-source-release.zip.asc</a></td>
-          </tr>
-        </tbody>
-      </table>
       </subsection>
 
       <subsection name="Previous Versions">
-        
-      <p>Older non-recommended releases can be found on our <a href="http://archive.apache.org/dist/maven/plugins/">archive site</a>.</p>
-
+        <p>It is strongly recommended to use the latest release version of <strong>${project.name}</strong> to take advantage of the newest features and bug fixes.</p>
+        <p>Older non-recommended releases can be found on our <a href="https://archive.apache.org/dist/maven/plugins/">archive site</a>.</p>
       </subsection>
     </section>
   </body>
 </document>
-