feat: Add NetID OAuth provider integration and update login UI

- Implemented NetID OAuth provider in app/auth/oauth.py
- Added styles for NetID login button in app/static/css/styles.css
- Updated login.html to include NetID login option with custom button
- Modified docker-compose.yml to include NetID client credentials
- Enhanced social login setup documentation to include NetID instructions
- Created demo environment configuration file (.env.demo) for easier setup
- Updated .env.template to include NetID configuration options
- Added comprehensive README.md with project features and setup instructions

.env.demo

@@ -0,0 +1,74 @@
+# LeagueLedger Demo Environment Configuration
+# This file contains example values for development/demo purposes
+# DO NOT use these values in production!
+
+# Database Configuration
+DB_HOST=localhost
+DB_PORT=5432
+DB_NAME=leagueledger_demo
+DB_USER=leagueledger_user
+DB_PASSWORD=demo_password_123
+
+# Application Settings
+SECRET_KEY=demo-secret-key-replace-in-production-e8a1b2c3d4e5f6
+DEBUG=True
+ALLOWED_HOSTS=localhost,127.0.0.1,demo.leagueledger.com
+BASE_URL=http://localhost:8000
+TIMEZONE=Europe/Dublin
+
+# Email Configuration
+EMAIL_BACKEND=smtp
+EMAIL_HOST=smtp.mailgun.org
+EMAIL_PORT=587
+EMAIL_USE_TLS=True
+EMAIL_HOST_USER=postmaster@demo.leagueledger.com
+EMAIL_HOST_PASSWORD=demo_mail_password_123
+DEFAULT_FROM_EMAIL=noreply@demo.leagueledger.com
+
+# Security Settings
+# These are set to False for local development
+SESSION_COOKIE_SECURE=False
+CSRF_COOKIE_SECURE=False
+SECURE_BROWSER_XSS_FILTER=True
+SECURE_CONTENT_TYPE_NOSNIFF=True
+
+# OAuth Providers - Example values (these are not real credentials)
+# Google
+GOOGLE_CLIENT_ID=123456789012-abcdefghijklmnopqrstuvwxyz123456.apps.googleusercontent.com
+GOOGLE_CLIENT_SECRET=GOCSPX-abcdefghijklmnopqrstuvwxyz12345
+
+# Facebook
+FACEBOOK_CLIENT_ID=1234567890123456
+FACEBOOK_CLIENT_SECRET=abcdef0123456789abcdef0123456789
+
+# GitHub
+GITHUB_CLIENT_ID=Iv1.abcdef1234567890
+GITHUB_CLIENT_SECRET=abcdef1234567890abcdef1234567890abcdef12
+
+# LinkedIn
+LINKEDIN_CLIENT_ID=abcdefghij1234567890
+LINKEDIN_CLIENT_SECRET=ABCDEfghij1234567890abcdefghijklmno
+
+# Microsoft
+MICROSOFT_CLIENT_ID=12345678-1234-1234-1234-123456789012
+MICROSOFT_CLIENT_SECRET=abc~DEF.ghiJKLmnoPQRstuvwxyz_12345678
+MICROSOFT_TENANT=common
+
+# Discord
+DISCORD_CLIENT_ID=123456789012345678
+DISCORD_CLIENT_SECRET=abcDEFghi1234567890JKLMNO_pqrSTUvwxyz
+
+# Authentik
+AUTHENTIK_CLIENT_ID=yourAuthentikClientID
+AUTHENTIK_CLIENT_SECRET=yourAuthentikClientSecret
+AUTHENTIK_CONFIG_URL=https://authentik.example.com/application/o/leagueledger/.well-known/openid-configuration
+
+# NetID
+NETID_CLIENT_ID=leagueledger-netid-client
+NETID_CLIENT_SECRET=netid-client-secret-abcdef1234567890
+
+# Feature Flags
+ENABLE_REGISTRATION=True
+ENABLE_PASSWORD_RESET=True
+ENABLE_EMAIL_VERIFICATION=True
+ENABLE_SOCIAL_LOGIN=True