refactor(routes): remove unused categories route files

routes/categories.js

@@ -1,9 +0,0 @@
-/*
- * The purpose of this module is to render the category page when the route is requested
- */
-
-// Renders categories page when `/categories` route is requested
-module.exports.getCategories = async (request, response, next) => {
-  response.render('categories', { title: 'Categories' })
-}
-

views/categories.pug

@@ -1,6 +0,0 @@
-extends layout
-
-block content
-  .layout-centered
-    h1= title
-    p Welcome to #{title}