chore: upgrade Angular 8 to 11 (#240)

* fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ANGULARCORE-1070902

* Complete pre-requisites: https://update.angular.io/?l=2&v=8.2-11.0

* roll back to "@angular/core": "~8.2.14"

* downgrade zones.js

* upgrade angular to 9

* > If you use TestBed.get, you should instead use TestBed.inject. This new method has the same behavior, but is type safe.

* Run ng update @angular/core@10 @angular/cli@10

* Run ng update @angular/core @angular/cli to upgrade to v11

* remove "karma-coverage-istanbul-reporter"

* remove node-sass (deprecated)

* get coverage & testing working again

* fix tests

* update coverage reporting

* add coveralls back

* build error fixed (routerOptions)

* bump version

* fix coverage reporting on console

* remove gitter - no longer active

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

README.md

@@ -2,7 +2,6 @@
 [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fmailchain%2Fmailchain-web.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2Fmailchain%2Fmailchain-web?ref=badge_shield)
 [![Build Status](https://travis-ci.com/mailchain/mailchain-web.svg?branch=master)](https://travis-ci.com/mailchain/mailchain-web)
 [![Coverage Status](https://coveralls.io/repos/github/mailchain/mailchain-web/badge.svg?branch=master)](https://coveralls.io/github/mailchain/mailchain-web?branch=master)
- [![Join the chat at https://gitter.im/Mailchain/community](https://badges.gitter.im/Mailchain/mailchain.svg)](https://gitter.im/Mailchain/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
 <!-- @import "[TOC]" {cmd="toc" depthFrom=1 depthTo=6 orderedList=false} -->
 

angular.json

@@ -17,6 +17,7 @@
         "build": {
           "builder": "@angular-devkit/build-angular:browser",
           "options": {
+            "aot": true,
             "outputPath": "dist/mailchain-web",
             "index": "src/index.html",
             "main": "src/main.ts",
@@ -33,8 +34,7 @@
               "node_modules/jquery/dist/jquery.js",
               "node_modules/popper.js/dist/umd/popper.js",
               "node_modules/bootstrap/dist/js/bootstrap.js"
-            ],
-            "es5BrowserSupport": true
+            ]
           },
           "configurations": {
             "production": {
@@ -47,7 +47,6 @@
               "optimization": true,
               "outputHashing": "all",
               "sourceMap": false,
-              "extractCss": true,
               "namedChunks": false,
               "aot": true,
               "extractLicenses": true,
@@ -58,6 +57,10 @@
                   "type": "initial",
                   "maximumWarning": "2mb",
                   "maximumError": "5mb"
+                },
+                {
+                  "type": "anyComponentStyle",
+                  "maximumWarning": "6kb"
                 }
               ]
             }