fix icons and remove redundant file (#3150)

Author: wjayesh

docs/book/user-guide/production-guide/README.md

@@ -1,8 +1,9 @@
 ---
+icon: tree
 description: Level up your skills in a production setting.
 ---
 
-# 🐔 Production guide
+# Production guide
 
 The ZenML production guide builds upon the [Starter guide](../starter-guide/README.md) and is the next step in the MLOps Engineer journey with ZenML. If you're an ML practitioner hoping to implement a proof of concept within your workplace to showcase the importance of MLOps, this is the place for you.
 

docs/book/user-guide/production-guide/production-guide.md

@@ -1,8 +1,9 @@
 ---
+icon: seedling
 description: Kickstart your journey into MLOps with the essentials of ZenML.
 ---
 
-# 🐣 Starter guide
+# Starter guide
 
 Welcome to the ZenML Starter Guide! If you're an MLOps engineer aiming to build robust ML platforms, or a data scientist interested in leveraging the power of MLOps, this is the perfect place to begin. Our guide is designed to provide you with the foundational knowledge of the ZenML framework and equip you with the initial tools to manage the complexity of machine learning operations.