Remove unused dependencies (related #73)

Author: ShukantPal

packages/webdoc-cli/package.json

@@ -52,10 +52,6 @@
     "array.prototype.flatmap": "~1.2.3",
     "fs-extra": "^9.0.1",
     "globby": "11.0.0",
-    "gulp": "^4.0.2",
-    "gulp-babel": "^8.0.0",
-    "gulp-util": "^3.0.8",
-    "jsdoc": "3.6.4",
     "lodash.merge": "4.6.2",
     "markdown-it": "^11.0.0",
     "markdown-it-highlightjs": "^3.1.0",
@@ -64,7 +60,6 @@
     "perf_hooks": "~0.0.1",
     "pkg-up": "~3.1.0",
     "read-pkg-up": "~7.0.1",
-    "requizzle": "0.2.3",
     "yargs": "15.3.1"
   },
   "devDependencies": {