Revert "Add global-agent to dependencies; Update Readme w/ instructions"

This reverts commit 39f5a8389b8ff4afcb18fb19a0ca20d2552abc83.

Signed-off-by: zjpersc <zjpersc@gmail.com>

packages/techdocs-cli/package.json

@@ -69,7 +69,6 @@
     "commander": "^9.1.0",
     "dockerode": "^3.3.1",
     "fs-extra": "^10.0.1",
-    "global-agent": "^3.0.0",
     "http-proxy": "^1.18.1",
     "react-dev-utils": "^12.0.0-next.60",
     "serve-handler": "^6.1.3",