Add / Document functionality to move ~/.codeium directory

[kanielrkirby]

Hey there, love the project!

I was wondering if there is / are plans to implement functionality to move the ~/.codeium directory using something like environment variables? Configuration related things typically go into the ~/.config / $XDG_CONFIG_DIR directory, as it helps encapsulate configuration related files together for storage / backup / source control.

Would be happy to implement myself, but wasn't sure if the functionality was something that happened across the different implementations of Codeium, or just in NeoVim.