Fix typos

* fixing typos and Prerequisites

* run prettier

* remove anoying submodule

exercises/concept/basics/.meta/design.md

@@ -32,7 +32,7 @@
 
 - `basics`: know what a variable is; know how to define an immutable variable; know how to define a mutable variable; know how to update a mutable variable; know how to use type inference for variables; know how to define a method; know how to return a value from a method; know how to call a method; know that methods must be defined in classes; know how to define an integer; know how to use mathematical operators on integers; know how to define single- and multiline comments.
 
-## Prequisites
+## Prerequisites
 
 There are no prerequisites.