Install syncthing via rpm-ostree; remove unused scrpts

recipes/common/jp-packages.yml

@@ -2,8 +2,6 @@
 # yaml-language-server: $schema=https://schema.blue-build.org/module-list-v1.json
 modules:
   - type: script
-    scripts:
-      - install-syncthing.sh
     snippets:
       - rpm --import https://brave-browser-rpm-release.s3.brave.com/brave-core.asc
   - type: rpm-ostree
@@ -25,4 +23,9 @@ modules:
       - xclip
       - bat
       - brave-browser
+      - syncthing
+  - type: systemd
+    user:
+      enabled:
+        - syncthing
   - from-file: common/ms-fonts.yml