feat: update ppt script

Author: JimmyLv

package.json

@@ -11,7 +11,7 @@
     "format": "prettier --write **/*.md",
     "lint": "textlint **/*.md",
     "lint:fix": "yarn lint --fix",
-    "ppt": "nodeppt generate ./演讲 ./slides -a && hs slides"
+    "ppt": "nodeppt generate ./演讲 ./slides -a"
   },
   "lint-staged": {
     "*.md": [
@@ -26,6 +26,7 @@
     }
   },
   "devDependencies": {
+    "nodeppt": "^1.4.5",
     "husky": "^4.2.3",
     "lint-staged": "^7.3.0",
     "prettier": "2.0.2",