docs: Add venv-selector.nvim to Python extras

[vh-x]

This PR adds documentation for venv-selector.nvim to the Python extras section.

The plugin is already included in the Python extras but was missing from the docs.

[windowsrefund]

I really think something should be pointed out with regard to the dependency on Telescope. I remember being really confused when i installed this Extra only to stumble across the behavior of enabled. Like many people, I don't run Telescope anymore and have moved to Snacks.

[vh-x]

I really think something should be pointed out with regard to the dependency on Telescope. I remember being really confused when i installed this Extra only to stumble across the behavior of enabled. Like many people, I don't run Telescope anymore and have moved to Snacks.

I agree. I was waiting for the change of this behavior to be merged since the plugin now supports alternatives to Telescope. For now, I've added my own config to make it work with fzf-lua.