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.

src/components/participants/participants-columns.tsx

@@ -3,20 +3,22 @@
 import { type ColumnDef } from "@tanstack/react-table";
 import { formatDistanceToNow } from "date-fns";
 import {
-  MoreHorizontal,
-  Eye,
-  Edit,
-  Trash2,
   Copy,
-  User,
+  Edit,
+  Eye,
   Mail,
+  MoreHorizontal,
   TestTube,
+  Trash2,
+  User,
 } from "lucide-react";
 import Link from "next/link";
 
+import { toast } from "sonner";
 import { Badge } from "~/components/ui/badge";
 import { Button } from "~/components/ui/button";
 import { Checkbox } from "~/components/ui/checkbox";
+import { DataTableColumnHeader } from "~/components/ui/data-table-column-header";
 import {
   DropdownMenu,
   DropdownMenuContent,
@@ -25,8 +27,6 @@ import {
   DropdownMenuSeparator,
   DropdownMenuTrigger,
 } from "~/components/ui/dropdown-menu";
-import { DataTableColumnHeader } from "~/components/ui/data-table-column-header";
-import { toast } from "sonner";
 
 export type Participant = {
   id: string;