[FR] export function

[loy124]

Feature Description

export function in the web version.
I want to download Markdown format, HTML, or even PDF through export.

Use Cases

can also use the export function in the web version
Can be used without being dependent on the app
It can be used for educational materials or blogs

User Impact

First, it is very useful when transferring data using a general MD.
Second, if you create a PDF using MD, it can be used to distribute educational materials or convey information.

Potential Implementation Ideas

No response

Additional Context

No response