server.js: `app.del()` --> `app.delete()`
server.js: `app.del()` --> `app.delete()`

Remove deprecation warnings when the server is initiated.

bkimminich/juice-shop,bkimminich/juice-shop,bkimminich/juice-shop,bkimminich/juice-shop,bkimminich/juice-shop,bkimminich/juice-shop