Update index.md

Author: multitudes

docs/index.md

@@ -173,7 +173,7 @@ Also there is the question of priority:
 How do we write down a grammar that contains an infinite number of valid strings? We obviously can’t list them all out. Instead, we create a finite set of rules.  
 This is from the book "Crafting Interpreters" by Bob Nystrom. He explains that a grammar naturally describes the hierarchical structure of most programming language constructs. For example:  
 
-<img src="assets/expression_grammar.png" alt="Expression Grammar" width="800">
+<img src="../assets/expression_grammar.png" alt="Expression Grammar" width="800">
 
 ## Grammar of our Shell
 This is a good starting point for our grammar.