Update _config.yml

Author: WangRongsheng

_config.yml

@@ -58,7 +58,7 @@ og_image: # The site-wide (default for all links) Open Graph preview image
 github_username: FreedomIntelligence # your GitHub user name
 hf_username: FreedomIntelligence # your hf user name
 rednote_username: 683e7dcc000000001d009399 # your rednote user name
-wechat: https://github.com/FreedomIntelligence
+wechat: https://github.com/freedomai-lab/.github/blob/main/profile/freedomai.jpg
 lab_email: [email protected]
 gitlab_username: # your GitLab user name
 twitter_username: # your Twitter handle