Add description to community partner (#1429)

Author: nikoshell

src/content/sponsors/junior-guru/index.md

@@ -1,6 +1,9 @@
 ---
 name: Junior Guru
-description: ""
+description:
+  "Junior.guru is a project that aims to help people who want to learn
+  programming and get their first job in IT. It offers a club, a guidebook,
+  courses, jobs, news, and a community for both juniors and seniors."
 url: https://junior.guru/
 socials:
   youtube: https://www.youtube.com/@juniordotguru