Revert "rearrange folders"

This reverts commit 75cf00bf0dc0f8e04db9439b16b73ae3b59d729f.
Revert "app overhaul (node.js, mongodb and express)"

This reverts commit 9269b21ce10eace17a28f24c30d5a0dc7da5d2fd.
app overhaul (node.js, mongodb and express)

1)old files remain untouched. New stuff is contained within the folder
called "nodejs app"
2) implemented a very basic user login/logout system + user profile;
bugs and cookie features to be fixed later