Add demo accounts, live calls, and billing pages, and update logo

Implement new pages for demo login, live calls, and billing. Add routing for these pages and update the application logo to an audio waveform icon.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 1b434963-c192-4aed-a584-81485dc74647
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 0fff9fcc-6f52-4a89-83d7-2e0e967d9af9
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/18048fd5-ed9b-4707-b0fb-7685b1fba16a/1b434963-c192-4aed-a584-81485dc74647/UBD49Ha
