update: More detailed Session description

[jermanuts]

Changes proposed in this PR:

Explain how Session open group works. Current one is vague and lacking.

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[jermanuts]

Should we recommend also disabling Link previews as mentioned here https://discuss.privacyguides.net/t/critical-flaws-in-desktop-session-messenger/16674 ?

And other problems mentioned?

[dngray]

can we link to a resource which explains why this is the case in more detail? or explain why ourselves

that might be a better idea.

[jermanuts]

I got it from https://getsession.org/lightpaper/pdf. Their docs are pretty lacking tbh.

EDIT: https://docs.oxen.io/oxen-docs/products-built-on-oxen/session/guides/open-group-setup and ofc you can check the whitepaer https://arxiv.org/pdf/2002.04609.pdf