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/activity.model.ts

@@ -0,0 +1,37 @@
+import { IActor, IGroup } from "./actor";
+import { IMember } from "./actor/member.model";
+import {
+  ActivityDiscussionSubject,
+  ActivityEventCommentSubject,
+  ActivityEventParticipantSubject,
+  ActivityEventSubject,
+  ActivityGroupSubject,
+  ActivityMemberSubject,
+  ActivityPostSubject,
+  ActivityResourceSubject,
+  ActivityType,
+} from "./enums";
+import { IEvent } from "./event.model";
+import { IPost } from "./post.model";
+import { IResource } from "./resource";
+
+export type ActivitySubject =
+  | ActivityEventSubject
+  | ActivityPostSubject
+  | ActivityMemberSubject
+  | ActivityResourceSubject
+  | ActivityDiscussionSubject
+  | ActivityGroupSubject
+  | ActivityEventCommentSubject
+  | ActivityEventParticipantSubject;
+
+export interface IActivity {
+  id: string;
+  type: ActivityType;
+  subject: ActivitySubject;
+  subjectParams: { key: string; value: string }[];
+  author: IActor;
+  group: IGroup;
+  object: IEvent | IPost | IGroup | IMember | IResource;
+  insertedAt: string;
+}