remove keru.org references

web/mirror-cache.html

@@ -25,7 +25,7 @@
 
             <h3>Download order</h3>
             <ul class="features">
-                <li><strong>1. <code>SOURCE_MIRROR</code></strong> — tried first when set (the org runs <code>mirror.keru.org</code> so the org can carry most of the traffic).</li>
+                <li><strong>1. <code>SOURCE_MIRROR</code></strong> — tried first when set; run a mirror of source tarballs and point it here.</li>
                 <li><strong>2. Upstream</strong> — the canonical source URL from the recipe. Used when no mirror is set or the mirror lacks a file.</li>
                 <li><strong>Verification at every step.</strong> A file that doesn't match its checksum is dropped, and the next source in line is tried. Tampered files never reach a build.</li>
             </ul>
@@ -45,7 +45,7 @@
 
             <h3>Working offline, or your own mirror</h3>
             <div class="code-block"># warm the cache once, then build with the network down
-SOURCE_MIRROR=mirror.keru.org kama fetch busybox
+SOURCE_MIRROR=https://mirror.example.org kama fetch busybox
 ...
 CACHEDIR=/var/cache/kama kama make busybox   # no network needed</div>
             <p>Run a mirror yourself and point <code>SOURCE_MIRROR</code> at it. The layout mirrors <code>dl/</code>; the fetch layer treats it as a read-mostly source of truth.</p>