Refactor typescript arrow function type

Make arrow function type less verbose and easier to read

Input

export const playground: (
  object?: Partial,
) => PlaygroundSection = config =>
  baseSection({
    type: SectionType.Playground,
    ...config,
  });

Output

export const playground = (
  config?: Partial,
): PlaygroundSection =>
  baseSection({
    type: SectionType.Playground,
    ...config,
  });