[UI updates] Registration

[jayadinni]

1. Logo url validation: Please provide validation for entering the url "Please enter valid url"
2. After registration, provide success message as follows:

3. After login for the first time, the logout link is missing as follows:

4. If issuer logo is not available please add placeholder image as follows:

5. Prompt user to enter OTP as '1234' as follows:

[jayadinni]

@tejash-jl Need to display message to add "Please enter OTP 1234, as this is demo portal"