Switched to puppeteer for pdf generation

ref #5

package.json

@@ -45,7 +45,7 @@
     "cors": "^2.8.5",
     "dotenv": "^8.2.0",
     "express": "^4.17.1",
-    "html-pdf": "^2.2.0",
+    "puppeteer": "^7.0.1",
     "reflect-metadata": "^0.1.13",
     "routing-controllers": "^0.9.0-alpha.6",
     "routing-controllers-openapi": "^2.2.0"
@@ -54,6 +54,7 @@
     "@odit/license-exporter": "^0.0.9",
     "@types/express": "^4.17.11",
     "@types/node": "^14.14.22",
+    "@types/puppeteer": "^5.4.3",
     "nodemon": "^2.0.7",
     "release-it": "^14.2.2",
     "rimraf": "^3.0.2",
@@ -73,4 +74,4 @@
       "publish": false
     }
   }
-}
+}