Remove unused scss files.

src/scss/uppy.scss

@@ -1,18 +0,0 @@
-/**
-* Uppy CSS and all of its out-of-the-box plugins
-*/
-
-@import '_variables.scss';
-@import '_utils.scss';
-@import '_animation.scss';
-@import '_microtip.scss';
-@import '_common.scss';
-@import '_fileinput.scss';
-@import '_informer.scss';
-@import '_dashboard.scss';
-@import '_dragdrop.scss';
-@import '_provider.scss';
-@import '_url.scss';
-@import '_progressbar.scss';
-@import '_statusbar.scss';
-@import '_webcam.scss';