Option to save conversation with stampy-chat

[LeMurphant]

https://discord.com/channels/677546901339504640/1125882946952384635/1197603901805957201

I'd like something similar to what ChatGPT does to share conversation with a dedicated shareable URL. I don't think being able to continue the conversation from the URL is important, it's mostly to share the output, e.g. to explain a concept on discord or to report an issue with the bot.

[MatthewBaggins]

Relatedly, I'd appreciate an option to export the conversation into txt/markdown