build: switch from yarn to npm to manage js dependencies and move js contents to root

yarn v1 is being deprecated and starts to have some issues

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

src/types/instance.model.ts

@@ -0,0 +1,16 @@
+import { InstanceFollowStatus } from "./enums";
+
+export interface IInstance {
+  domain: string;
+  hasRelay: boolean;
+  relayAddress: string | null;
+  followerStatus: InstanceFollowStatus;
+  followedStatus: InstanceFollowStatus;
+  personCount: number;
+  groupCount: number;
+  followersCount: number;
+  followingsCount: number;
+  reportsCount: number;
+  mediaSize: number;
+  eventCount: number;
+}