Sync desktop app package.json with other Khoj clients metadata

- Make `bump_version.sh' script set version for the Khoj desktop app too
- Sync Khoj desktop app authors, license, description and version with
  the other interfaces and server
- Update description in packages metadata to match project subtitle on Github

scripts/bump_version.sh

@@ -9,6 +9,10 @@ do
             # Get current project version
             current_version=$OPTARG
 
+            # Bump Desktop app to current version
+            cd $project_root/src/interface/desktop
+            sed -E -i.bak "s/version\": \"(.*)\",/version\": \"$current_version\",/" package.json
+
             # Bump Obsidian plugin to current version
             cd $project_root/src/interface/obsidian
             sed -E -i.bak "s/version\": \"(.*)\",/version\": \"$current_version\",/" package.json