Using `opts = {}` when creating plugins with out a `setup.lua.example`

[JustBarnt]

Instead of inserting a commented-out line for the plugin when the plugin doesn't have a setup.lua.example I think we should instead just follow lazy.nvim documentation to use opts = {} that way when installing, if we just want the default configuration for plugins; which I myself tend to go with the default on quite a bit, at least during the first bit of using a plugin.

We could also add a configuration open_config that defaults to true which would still open the file in that case; if you know you want to edit the configuration right away.

I'm currently working on a PR for this if it is something you would be interested in.

• Add configuration for whether a configuration should open after creation or not