Revert "Merge pull request #2476 from steemit/1637-add-nsp"

[bnchdrff]

This reverts commit 7735ca3, reversing
changes made to 63b561e.

updates cause this error in production build mode:

  xxx GET /assets/app-1b095b1ada8cb66aecaa.css 500 14ms - 8a1b2e6c3cc9df60f2a7f1d91a
(node:22) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): TypeError: next is not a function

  TypeError: downstream.call is not a function
      at Object.<anonymous> (/var/app/node_modules/koa-mount/index.js:58:23)
      at Generator.next (<anonymous>)
      at Object.<anonymous> (/var/app/node_modules/koa-mount/index.js:52:19)
      at Generator.next (<anonymous>)
      at Object.<anonymous> (/var/app/node_modules/koa-mount/index.js:52:19)
      at Generator.next (<anonymous>)
      at onFulfilled (/var/app/node_modules/co/index.js:65:19)
      at /var/app/node_modules/co/index.js:54:5
      at new Promise (<anonymous>)
      at Object.co (/var/app/node_modules/co/index.js:50:10)
      at Object.toPromise (/var/app/node_modules/co/index.js:118:63)
      at next (/var/app/node_modules/co/index.js:99:29)
      at onFulfilled (/var/app/node_modules/co/index.js:69:7)
      at /var/app/node_modules/co/index.js:54:5
      at new Promise (<anonymous>)
      at Object.co (/var/app/node_modules/co/index.js:50:10)