fix: remove empty styles.css and remove styles.css from release workflow

Author: lanice

.github/workflows/release.yml

@@ -27,7 +27,7 @@ jobs:
           yarn install
           yarn compile
           mkdir ${{ env.PLUGIN_NAME }}
-          cp main.js manifest.json styles.css ${{ env.PLUGIN_NAME }}
+          cp main.js manifest.json ${{ env.PLUGIN_NAME }}
           zip -r ${{ env.PLUGIN_NAME }}.zip ${{ env.PLUGIN_NAME }}
           ls
           echo "::set-output name=tag_name::$(git tag --sort version:refname | tail -n 1)"