Change category filter to use slug instead of sys.id (#6)

* Change category filter to use slug instead of sys.id

* Add slug to module and card

routes/courses.js

@@ -19,9 +19,13 @@ router.get('/categories/:category', catchErrors(async function (req, res, next)
   let courses = []
   let categories = []
   let activeCategory = ''
-  courses = await getCoursesByCategory(req.params.category, req.query.locale, req.query.api)
-  categories = await getCategories()
-  activeCategory = categories.find((category) => category.sys.id === req.params.category)
+  try {
+    categories = await getCategories()
+    activeCategory = categories.find((category) => category.fields.slug === req.params.category)
+    courses = await getCoursesByCategory(activeCategory.sys.id, req.query.locale, req.query.api)    
+  } catch (e) {
+    console.log('Error ', e)
+  }
   res.render('courses', { title: `${activeCategory.fields.title} (${courses.length})`, categories, courses })
 }))