chore: minor alignments with cli 8.3 (#3433)

- align `browserlist` location
- use correct schema path in `angular.json`
- remove unnecessary `ng-package.prod.json`

angular.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "./node_modules/@angular-devkit/core/src/workspace/workspace-schema.json",
+  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
   "version": 1,
   "newProjectRoot": "",
   "projects": {
@@ -11,12 +11,11 @@
         "build": {
           "builder": "@angular-devkit/build-ng-packagr:build",
           "options": {
+            "tsConfig": "src/tsconfig.json",
             "project": "src/ng-package.json"
           },
           "configurations": {
             "production": {
-              "tsConfig": "src/tsconfig.json",
-              "project": "src/ng-package.prod.json"
             }
           }
         },

ssr-app/browserslist

@@ -0,0 +1,7 @@
+# This file is currently used by autoprefixer to adjust CSS to support the below specified browsers
+# For additional information regarding the format and rule options, please see:
+# https://github.com/browserslist/browserslist#queries
+# For IE 9-11 support, please uncomment the last line of the file and adjust as needed
+last 2 versions
+Firefox ESR
+IE 10-11