Make flag to change logic for link attachment

[DONXAKer]

Is your feature request related to a problem? Please describe.
Yes its problem, beacuse when add attachment and then put in code like macros for confulence in markdown, then it replace for url to /download/.../namefile. Sometimes it's not work if access to attachment need add auth.

Describe the solution you'd like
So need configuration? that can ignore replace url in module

[DONXAKer]

mark/attachment/attachment.go

Line 211 in 649c20d

return Attachment{

in this line replace name to new address? so need alternative