Issue#36: .deb deploys default TLS certificate and private key (#39)

* issue#36: Generating TLS key and self-signed cert after installing/upgrading the package

* issue#36: Updated libstdc++.a dependency to v10

* issue#36: Generate self-signed certs after install/upgrade

* issue#36: Updated dependencies

* issue#36: Check for pre-existence of key/cert

src/package.json

@@ -1,6 +1,6 @@
 {
   "name": "ztncui",
-  "version": "0.5.8",
+  "version": "0.6.3",
   "private": true,
   "scripts": {
     "start": "node ./bin/www",
@@ -17,9 +17,9 @@
     "express-session": "^1.15.6",
     "express-validator": "^4.3.0",
     "got": "^7.1.0",
-    "helmet": "^3.12.0",
+    "helmet": "^3.23.0",
     "ip-address": "^5.8.9",
-    "jquery": "^3.4.1",
+    "jquery": "^3.5.1",
     "morgan": "~1.9.1",
     "node-persist": "^2.1.0",
     "pug": "^2.0.4",