style: format code with Prettier

This commit fixes the style issues introduced in 995562a according to the output
from Prettier.

Details: #35

md-docs/1.getting-started.md

@@ -81,7 +81,7 @@ In some cases you might want to initialize the state with a function, for exampl
 
 ```tsx
 const [state, setState] = useRGS<number>("counter", () =>
-  typeof localStorage === "undefined" ? 1 : (localStorage.getItem("counter") ?? 1),
+  typeof localStorage === "undefined" ? 1 : localStorage.getItem("counter") ?? 1,
 );
 ```