Enhance HRIStudio with immersive experiment designer and comprehensive documentation updates

- Introduced a new immersive experiment designer using React Flow, providing a professional-grade visual flow editor for creating experiments.
- Added detailed documentation for the flow designer connections and ordering system, emphasizing its advantages and implementation details.
- Updated existing documentation to reflect the latest features and improvements, including a streamlined README and quick reference guide.
- Consolidated participant type definitions into a new file for better organization and clarity.

Features:
- Enhanced user experience with a node-based interface for experiment design.
- Comprehensive documentation supporting new features and development practices.

Breaking Changes: None - existing functionality remains intact.

scripts/seed-dev.ts

@@ -1,5 +1,4 @@
 import bcrypt from "bcryptjs";
-import { eq } from "drizzle-orm";
 import { drizzle } from "drizzle-orm/postgres-js";
 import postgres from "postgres";
 import * as schema from "../src/server/db/schema";