feat: Allow `lazy.nvim` to just handle default config for a plugin

This PR will default plugins that do not have a `setup.lua.example` to just use `opts = {}` and removes the commented out repo link so the plugin will just work without having to edit the file. I also added a configuration `open_config_after_creation` which defauts to true; to retain previous behavior or the configuration opening after its installed. It can be set to `false` though to prevent the file from opening.