Update _config.yml

Author: kristinevog

_config.yml

@@ -26,7 +26,7 @@ author:
     name: asnocode.com
     avatar : assets/images/profile_picture.png
     avatar-webp: assets/images/profile_picture.webp
-    avatar-thumb: assets/images/profile_picture-thumb.jpg
+    avatar-thumb: assets/images/profile_picture.png
     author-bio : "DevOps Engineer at Emergn. Cloud Solutions. Data Platforms. Infrastructure as Code. Automation."
     ads : https://ui.adsabs.harvard.edu/search/p_=0&q=orcid%3A0000-0002-3493-6638&sort=date%20desc%2C%20bibcode%20desc
     facebook: https://www.facebook.com/asnocode