Remove no longer needed references

Author: WillSams

frontend/src/views/layouts/default.pug

@@ -3,8 +3,7 @@ html
   head
     meta(charset='utf-8')
     meta(name='viewport' content='width=device-width, initial-scale=1, shrink-to-fit=no')
-    title='My Project'
-    link(href='/css/bootstrap.min.css' rel='stylesheet')
+    title='Example - Node.js, Express, Pug, and Bootstrap'
     link(href='/css/application.css' rel='stylesheet')
     link(rel='shortcut icon' type='image/jpg' href='/img/favicon.ico')
   body
@@ -18,6 +17,4 @@ html
     footer.container-fluid.navbar-dark.bg-dark
       include footer-partial
     script(src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js')
-    script(src='https://cdnjs.cloudflare.com/ajax/libs/popper.js/2.11.8/umd/popper.min.js')
-    script(src='/js/bootstrap.bundle.min.js')
     block js