[Improvement] Refactor the document about security

[jerqi]

What would you like to be improved?

Refactor the document about docs/security.md.

How should we improve?

Refactor the document about security. Split the document about security into 3 parts. Authentication, HTTPS and access control.

[Dipti0704]

i would like to work on this issue kindly assign me

[jerryshao]

What do you actually want to do in this issue @jerqi , the description is too simple, others even don't know what do you actually want to fix, please refactor this issue to add more words.

@Dipti0704 thanks for your interest and PR, if this issue is not related to your change, can you please create another issue to track your work?