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/core/db-file.ts

@@ -0,0 +1,5 @@
+export class DbFile {
+  id: string;
+  resized: string;
+  thumbnail: string;
+}