fix: sass error when using main.scss in project
fix: sass error when using main.scss in project

```
SassError: Can't find stylesheet to import.
  >  @import "node_modules/spectrum-colorpicker/spectrum";
```
artf/grapesjs,QuorumDMS/grapesjs,artf/grapesjs,QuorumDMS/grapesjs,artf/grapesjs