chore(cactus_validator_socketio_indy): remove old python connector

- Remove old python connector cactus_validator_socketio_indy. It's been
    replaced with socketio-based cactus-plugin-ledger-connector-aries.
Depends on hyperledger-cacti#2947

Signed-off-by: Michal Bajer <michal.bajer@fujitsu.com>

Author: outSH

examples/cactus-example-discounted-asset-trade/package.json

@@ -10,8 +10,7 @@
     "build": "npm run build-ts && npm run build:dev:backend:postbuild",
     "build-ts": "tsc",
     "build:dev:backend:postbuild": "cp -f ../../yarn.lock ./dist/",
-    "build_pip_indy_package": "cd ../../packages-python/cactus_validator_socketio_indy && python3 setup.py bdist_wheel",
-    "start": "npm run build_pip_indy_package && docker-compose build && docker-compose up",
+    "start": "docker-compose build && docker-compose up",
     "start-dockerless": "node ./dist/www.js"
   },
   "dependencies": {