Add v0.4 to version picker

Signed-off-by: Nelo-T. Wallus <n.wallus@sap.com>

Author: ntnn

.vitepress/theme/components/VersionSelector.vue

@@ -29,6 +29,7 @@ interface Version {
 // Define available versions - update this list when adding new versions
 const versions: Version[] = [
   { name: 'main', label: 'main (latest)' },
+  { name: 'release-0.4', label: 'v0.4' },
   { name: 'release-0.3', label: 'v0.3' },
   { name: 'release-0.2', label: 'v0.2' },
   { name: 'release-0.1', label: 'v0.1' },