update cover image and author intro

Author: cyyeh

packages/doc/blog/powering-rapid-data-apps-with-vulcansql.mdx

@@ -1,7 +1,7 @@
 ---
 authors:
   name: Andy Yen
-  title: contributor of VulcanSQL
+  title: core member of VulcanSQL
   url: https://github.com/onlyjackfrost
   image_url: https://avatars.githubusercontent.com/u/38731840?v=4
   email: andy.yen@cannerdata.com

packages/doc/blog/querying-your-data-easily-and-smartly-through-huggingface.mdx

@@ -1,19 +1,21 @@
 ---
 authors:
   - name: Eason Kuo
-    title: contributor of VulcanSQL
+    title: core member of VulcanSQL
     url: https://github.com/kokokuo
     image_url: https://avatars.githubusercontent.com/u/5389253?v=4
     email: eason.kuo@cannerdata.com
   - name: Jimmy Yeh
-    title: contributor of VulcanSQL
+    title: core member of VulcanSQL
     url: https://github.com/cyyeh
     image_url: https://avatars.githubusercontent.com/u/11023068?v=4
     email: jimmy.yeh@cannerdata.com
 ---
 
 # Querying Your Data Easily and Smartly through Hugging Face
 
+![cover](./static/cover-huggingface.jpg)
+
 *TLDR: VulcanSQL, a free and open-source data API framework built specifically for data applications, 
 empowers data professionals to generate and distribute data APIs quickly and effortlessly. 
 It takes your SQL templates and transforms them into data APIs, with no backend expertise necessary.*