techdocs: implement serve for the techdocs-cli (#1581)

* feat(techdocs-cli): point techdocs export to localhost:3000/api

* feat(techdocs-cli): add http-proxy package

* feat(techdocs-cli): add react-dev-utils package

* feat(techdocs-cli): implement serve and serve:mkdocs commands

* fix: use [module] prefix convention in console.log

* docs: added commands

* wip

* Fix type errors

Co-authored-by: Sebastian Qvarfordt <s.qvarfordt@gmail.com>

packages/techdocs-cli/package.json

@@ -49,6 +49,8 @@
     "chalk": "^4.1.0",
     "commander": "^5.1.0",
     "fs-extra": "^9.0.1",
+    "http-proxy": "^1.18.1",
+    "react-dev-utils": "^10.2.1",
     "serve-handler": "^6.1.3"
   }
 }