1) you are a public sector employee

2 during course of your employment you cannot carry on any other business for extra income

3) disciplinary action would be taken against you and yiu may be dismissed from service

No doubt no one is barred from creating any websites, but for commercial purposes, this should not hinder or hamper your employment functions. If your office needs you to disclose all your outside office commercial activities, you are bound by the employment rules, you may clarify from your establishment section about the rule in this regard. Some public sector companies permit their employees if they obtain written permission for such activity, you may clarify this too. This should not affect the code of conduct of the employee nor affect the service exigencies.

You have not mentioned the nature of business you wish to commence and operate through website. A public servant cannot engage in part-time job or any other business. There is a clear provision in Conduct Rules. There are few exceptions e.g certain State Government doctors can practice outside office hours with permission from department, provided he is not drawing non-practicing allowance. Unless the nature of business is such that it is forbidden by civil service rules you are free to launch the website.