Use the web's native share for sharing the image directly

Right now, the only way to share the note (as an image), is to download the image, and then share it.
We can perhaps utilize the native share https://developer.mozilla.org/en-US/docs/Web/API/Navigator/share in cases where this feature is supported by the browser to share directly.
This will definitely have a better experience on mobile, and we should be able to share the notes easily on mobile phones.
See compatibility of this API:
https://developer.mozilla.org/en-US/docs/Web/API/Navigator/share#browser_compatibility