Decide the User Agent requesting the cmd doc

[Sim4n6]

Idea

• Decide whether the requester of the cmd documentation is a browser or from cmdline.
• based on Flask -> Request -> User_Agent object.
• HTML_needed or not.

Reference

• https://flask.palletsprojects.com/en/1.1.x/api/#flask.Request.user_agent
• https://stackoverflow.com/questions/9878020/how-do-i-get-the-user-agent-with-flask
• https://tedboy.github.io/flask/generated/generated/werkzeug.UserAgent.html

[Sim4n6]

commit starting at 633cc59