[main]: Update mkdocs to zensical

docs/lectures/cryptography/01_intro.md

@@ -108,7 +108,7 @@ Any time you add or multiply any two numbers in the set, the result is always in
 - We can add or multiply any two numbers in the ring, and the result is in the ring
     - It is closed
 - Addition and multiplication are associative 
-    - (a+b)+c = a + (b+c)
+    - $(a+b)+c\space =\space a+(b+c)$
 - There is a neutral element 0 for addition
     - $a + 0 \equiv a\space mod \space m$
 - The additive inverse always exists