Prettied, Linted and updated angular.json according to the latest schematic of Angular CLI.

Now all that is needed is to make it ready for strict compiling.
Removed eslint-plugin-prettier as it is not recommended and causes errors for both eslint and prettier

Bumped to v8.0.0

overlord/src/app/ledger/ledger.ts

@@ -1,17 +1,6 @@
 import { Account } from '../core/account';
 
-export class LedgerItem {
-  date: string;
-  id: string;
-  name: string;
-  type: string;
-  narration: string;
-  debit: number;
-  credit: number;
-  running: number;
-  posted: boolean;
-  url: string;
-}
+import { LedgerItem } from './ledger-item';
 
 export class Ledger {
   startDate: string;