docs(readme): put F-Droid and Ko-fi buttons inline at equal height

Both at height 56 on one line — equal heights align on the baseline,
so no table/border workaround is needed.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

@@ -16,10 +16,8 @@ Reads, writes, and reminds — on top of the system calendar, with zero network
 </p>
 
 <p>
-<a href="https://f-droid.org/packages/de.jeanlucmakiola.calendula/"><img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png" alt="Get it on F-Droid" height="80"></a>
-</p>
-
-<p>
+<a href="https://f-droid.org/packages/de.jeanlucmakiola.calendula/"><img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png" alt="Get it on F-Droid" height="56"></a>
+&nbsp;
 <a href="https://ko-fi.com/jeanlucmakiola"><img src="https://storage.ko-fi.com/cdn/kofi2.png?v=3" alt="Support me on Ko-fi" height="56"></a>
 </p>