src/vs/workbench/contrib/welcome/gettingStarted/browser/gettingStartedService.ts/GettingStartedService/registerStartEntry
class GettingStartedService:	private registerStartEntry(categoryDescriptor: IGettingStartedStartEntryDescriptor): void {
		const oldCategory = this.gettingStartedContributions.get(categoryDescriptor.id);
		if (oldCategory) {
			console.error(`Skipping attempt to overwrite walkthrough. (${categoryDescriptor})`);
			return;
		}

		const category: IGettingStartedCategory = { ...categoryDescriptor, isFeatured: false };

		this.gettingStartedContributions.set(categoryDescriptor.id, category);
		this._onDidAddCategory.fire();
	}