chore: remove deprecated dingus package (#641)

Removes the deprecated dingus package which has been replaced by the
Template Playground (accordproject/template-playground).

- Delete packages/dingus/ directory
- Delete .github/workflows/build-and-deploy-dingus.yml
- Remove dingus script from root package.json

Closes #537

Signed-off-by: Shubh-Raj <shubhraj625@gmail.com>
Co-authored-by: Matt Roberts <7544022+mttrbrts@users.noreply.github.com>

Author: Shubh-Raj

package-lock.json

@@ -23,7 +23,6 @@
   "version": "0.16.25",
   "private": true,
   "scripts": {
-    "dingus": "npm run --workspace dingus",
     "build": "npm run build --workspaces --if-present",
     "postinstall": "npm run models:get",
     "models:get": "node ./scripts/external/getExternalModels.js",