remove yarn server command

package.json

@@ -3,8 +3,7 @@
         "rebuild-set": "spago psc-package-insdhall",
         "install-ps": "psc-package install",
         "build": "pulp --psc-package browserify -t dist/bundle.js",
-        "repl": "pulp --psc-package repl",
-        "server": "webpack-dev-server --env dev --mode development"
+        "repl": "pulp --psc-package repl"
     },
     "dependencies": {
         "@babel/polyfill": "^7.0.0",