chore: update sponsors (#2795)

Co-authored-by: Evan You <yyx990803@gmail.com>

Author: vue-bot

themes/vue/_config.yml

@@ -47,9 +47,6 @@ gold_sponsors:
   - url: 'https://www.frontenddeveloperlove.com/'
     img: frontendlove.png
     name: FrontendLove
-  - url: 'https://onsen.io/vue/'
-    img: onsen_ui.png
-    name: Onsen UI
   - url: 'https://neds.com.au/'
     img: neds.png
     name: Neds