chore: remove fuck cssnano-cli

package.json

@@ -14,11 +14,7 @@
     "url": "git+https://github.com/QingWei-Li/docsify.git"
   },
   "main": "lib/docsify.js",
-  "files": [
-    "lib",
-    "src",
-    "themes"
-  ],
+  "files": ["lib", "src", "themes"],
   "scripts": {
     "bootstrap": "npm i && lerna bootstrap && npm run build:ssr",
     "serve": "node server",
@@ -30,12 +26,14 @@
     "css": "stylus src/themes/*.styl -u autoprefixer-stylus",
     "watch:css": "run-p 'css -- -o themes -w'",
     "watch:js": "node build/build.js",
-    "build:css:min": "mkdir lib/themes && run-p 'css -- -o lib/themes' && cssnano lib/themes/*",
+    "build:css:min":
+      "mkdir lib/themes && run-p 'css -- -o lib/themes' && node build/mincss.js",
     "build:css": "mkdir themes && run-p 'css --  -o themes'",
     "build:js": "cross-env NODE_ENV=production node build/build.js",
     "build:ssr": "node build/ssr.js",
     "build:cover": "node build/cover.js",
-    "build": "rimraf lib themes && run-s build:js build:css build:css:min build:ssr build:cover",
+    "build":
+      "rimraf lib themes && run-s build:js build:css build:css:min build:ssr build:cover",
     "pub:next": "cross-env RELEASE_TAG=next sh build/release.sh",
     "pub": "sh build/release.sh",
     "postinstall": "opencollective postinstall"
@@ -53,7 +51,7 @@
     "chokidar": "^2.0.2",
     "conventional-changelog-cli": "^1.3.5",
     "cross-env": "^5.1.3",
-    "cssnano-cli": "^1.0.5",
+    "cssnano": "^3.10.0",
     "eslint": "^4.14.0",
     "eslint-config-xo-space": "^0.18.0",
     "lerna": "^2.5.1",
@@ -69,13 +67,7 @@
     "rollup-plugin-uglify": "^2.0.1",
     "stylus": "^0.54.5"
   },
-  "keywords": [
-    "doc",
-    "docs",
-    "documentation",
-    "creator",
-    "generator"
-  ],
+  "keywords": ["doc", "docs", "documentation", "creator", "generator"],
   "collective": {
     "type": "opencollective",
     "url": "https://opencollective.com/docsify",