Apply Prettier to config and markdown files

ava.config.js

@@ -1,5 +1,4 @@
 export default {
-  "extensions": ["ts"],
-  "require": ["esm", "ts-node/register/transpile-only"]
+  extensions: ["ts"],
+  require: ["esm", "ts-node/register/transpile-only"],
 };
-