Start project fork feature

Updated schema, project service and UI
Still some polish to go.

Co-authored-by: Frank Noirot <franknoirot@users.noreply.github.com>

app/api/db/migrations/20210925001652_add_project_forking/migration.sql

@@ -0,0 +1,5 @@
+-- AlterTable
+ALTER TABLE "Project" ADD COLUMN     "forkedFromId" TEXT;
+
+-- AddForeignKey
+ALTER TABLE "Project" ADD FOREIGN KEY ("forkedFromId") REFERENCES "Project"("id") ON DELETE SET NULL ON UPDATE CASCADE;