chore: remove fuck cssnano-cli

build/mincss.js

@@ -0,0 +1,12 @@
+const cssnano = require('cssnano').process
+const path = require('path')
+const fs = require('fs')
+
+files = fs.readdirSync(path.resolve('lib/themes'))
+
+files.forEach(file => {
+  file = path.resolve('lib/themes', file)
+  cssnano(fs.readFileSync(file)).then(result => {
+    fs.writeFileSync(file, result.css)
+  })
+})