Optimize bio images

Author: RSTZZZ

_data/authors.yml

@@ -261,7 +261,7 @@ Sahar Omidi Shayegan:
   role: Master
   username: sahar.omidishayegan
   semantic_scholar_id: '2302559514'
-  avatar: /assets/images/bio/Sahar Omidi Shayegan.jpg
+  avatar: /assets/images/bio/sahar.omidi.shayegan.avatar.webp
   advisor: Reihaneh Rabbany
   alumni: false
   links:
@@ -283,7 +283,7 @@ Jacob-Junqi Tian:
   role: Intern
   username: jacob-junqi.tian
   semantic_scholar_id: '2320260830'
-  avatar: /assets/images/bio/Jacob-Junqi Tian.jpg
+  avatar: /assets/images/bio/jacob-junqi.tian.avatar.webp
   advisor: Reihaneh Rabbany
   date: May 2022
   bio: Works on projects related to NLP, LLM, and Reasoning
@@ -350,7 +350,7 @@ Hao Yu:
     url: https://scholar.google.com/citations?user=5Z10ts4AAAAJ&hl=zh-CN
   - label: LinkedIn
     url: https://www.linkedin.com/in/haoy/
-  avatar: /assets/images/bio/Hao Yu.jpg
+  avatar: /assets/images/bio/hao.yu.avatar.webp
   date: Fall 2022
   bio: Interested in LLMs, RAG and Data Mining. Worked on NER in online escort ads
     and LLMs in detecting misinformation.