Point source links at the public Codeberg repo

In-app help "Source" link and README now reference
codeberg.org/VARASYS/metronome (the public mirror) instead of the
internal git.varasys.io.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -5,7 +5,7 @@ Raspberry Pi Pico hardware build. Stack as many "meter lanes" as you like; each
 its own little metronome with a grouping, subdivision, drum voice and a per-step
 pattern with accents. Layering lanes produces polymeter and true ratio polyrhythm.
 
-**Live:** https://metronome.varasys.io
+**Live:** https://metronome.varasys.io · **Source:** https://codeberg.org/VARASYS/metronome
 
 It's a single, self‑contained `index.html` — **zero dependencies**: no framework,
 no build step, no bundled or CDN libraries, and nothing fetched at runtime. State

index.html

@@ -362,7 +362,7 @@
       <tr><td><kbd>Esc</kbd></td><td>Close tray / help · cancel an armed switch</td></tr>
     </table>
     <div class="help-about">
-      <p>Source: <a href="https://git.varasys.io/VARASYS/metronome" target="_blank" rel="noopener">git.varasys.io/VARASYS/metronome</a></p>
+      <p>Source: <a href="https://codeberg.org/VARASYS/metronome" target="_blank" rel="noopener">codeberg.org/VARASYS/metronome</a></p>
       <p><b>Your set lists, items and practice log live only in this browser</b> (localStorage) — nothing is uploaded. To move or share them, use the set-list <b>⋯</b> menu: <b>Share set-list link</b> copies a link encoding the whole set list (open it elsewhere to import a copy); <b>Share settings link</b> shares just the loaded item; <b>Export all / Import file</b> back up everything as a JSON file.</p>
       <p>This is a single-page app — save this page (<kbd>Ctrl/⌘+S</kbd>) and open the file to run it fully offline, no server needed. One catch when running from a local <code>file://</code>: it <b>won't auto-save your set list</b> between sessions, so export a backup (set-list <b>⋯</b> menu → <b>Export all</b>) to keep your work.</p>
     </div>