Add Vancouver reference style

[VerySweetBread]

What type of request is this?

New feature for an existing tool

Clear and concise description of the feature you are proposing

Please, add Vancouver system to citation generator

Is there example of this tool in the wild?

https://www.mybib.com/tools/vancouver-citation-generator

Additional context

No response

Validations

• Check the feature is not already implemented in the project.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• Check that the feature can be implemented in a client side only app (IT-Tools is client side only, no server).

[sharevb]

Hi @VerySweetBread , now available at https://sharevb-it-tools.vercel.app/citation-generator and docker image as soon as built