Versioning consistency and bump both the XPI and backend to version 0.2.0

frontend/templates/about.html

@@ -60,7 +60,7 @@
         <section class="link-item">
           <h2>Plugin</h2>
           <p>Install the Firefox plugin to save links directly from your browser. <a
-            href="https://git.kolkman.org/olaf/Link-Log/raw/branch/main/XPI/signed/LinkLog-0.1.0.xpi"
+            href="https://git.kolkman.org/olaf/Link-Log/raw/branch/main/XPI/signed/LinkLog-0.2.0.xpi"
             download>Download and install the Plugin</a>.</p>
         </section>
     </main>

frontend/version.json

@@ -1,3 +1,3 @@
 {
-  "version": "0.1.1"
+  "version": "0.2.0"
 }