feat: add page for describing cairo builtins

components/Starknet/modules/architecture_and_concepts/pages/Smart_Contracts/builtins.adoc

@@ -1,10 +1,10 @@
+[id="cairo_builtins"]
 = Cairo Builtins
 
-== Introduction
+_Builtins_, in Cairo, are predefined optimized low-level execution units that the Cairo VM uses to perform predefined computations that are expensive to perform in standard Cairo. Builtins enhance the functionality of the Cairo VM, enabling you to perform tasks such as using the Poseidon hash, range-checks, or ECDSA signature verifications, efficiently and using less gas.
 
-Builtins are predefined optimized low-level execution units which are added to the Cairo CPU board to perform predefined computations which are expensive to perform in standard Cairo. Builtins enhance the functionality of the Cairo virtual machine, allowing you to perform tasks such as Pedersen hash, Poseidon hash, range-checks, ECDSA signature verifications, Keccak hash, Bitwise operations, and EC operations efficiently and at a cheaper gas cost.
-
-== List of Cairo Builtins
+[#list-of-cairo-builtins]
+.List of Cairo builtins
 
 [cols="1,2,2"]
 |===