Fixes lint style errors

src/pages/NotFound/__tests__/__snapshots__/NotFound.tsx.snap

@@ -2,7 +2,7 @@
 
 exports[`<NotFound /> renders 1`] = `
 <div
-  class="NotFound"
+  class="not-found"
 >
   <p>
     Oops, Page was not found!

src/pages/NotFound/index.tsx

@@ -13,7 +13,7 @@ const NotFound = ({ staticContext }: Props) => {
     if (staticContext) staticContext.statusCode = 404
 
     return (
-        <div className={styles.NotFound}>
+        <div className={styles["not-found"]}>
             <Helmet title="Oops" />
             <p>Oops, Page was not found!</p>
         </div>

src/pages/NotFound/styles.module.scss

@@ -1,3 +1,3 @@
-.NotFound {
+.not-found {
     padding: 0 15px;
 }