rename pipe.md and randomHexColorCode

snippets/pipeFunctions.md

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+### pipeFunctions
+
+Performs left-to-right function composition.
+
+Use `Array.reduce()` with the spread operator (`...`) to perform left-to-right function composition.
+The first (leftmost) function can accept one or more arguments; the remaining functions must be unary.
+
+```js
+const pipeFunctions = (...fns) => fns.reduce((f, g) => (...args) => g(f(...args)));
+/*
+const add5 = x => x + 5
+const multiply = (x, y) => x * y
+const multiplyAndAdd5 = pipeFunctions(multiply, add5)
+multiplyAndAdd5(5, 2) -> 15
+*/
+```