Update author details in _config.yml; correct email and refine bio

Author: mag1cfrog

docs/_config.yml

@@ -18,16 +18,16 @@ github:
 
 social:
   name: Hanbo Wang
-  email: your-email@example.com
+  email: harrywong2017@gmail.com
   links:
     - https://github.com/mag1cfrog
 
 # Site Author
 author:
   name: Hanbo Wang
-  twitter: # your twitter username (optional)
+
   github: mag1cfrog
-  bio: Software Engineer specializing in Apache Spark optimization
+  bio: Data Engineer specializing in Apache Spark optimization
 
 # Build settings
 timezone: America/Los_Angeles