Use $XDG_CONFIG_HOME/lepton/leptonrc as well as $HOME/.leptonrc for configuration

[foundObjects]

Environment info

• OS: Arch Linux
• App Version (Command/Ctrl + ,): 1.9.2

Description of the problem / feature request / question:

To avoid cluttering the user's homedir check for a config file at $XDG_CONFIG_HOME/lepton/leptonrc as well as $HOME/.leptonrc

edit: it looks like this would be app.getPath(appData) to fetch XDG_CONFIG_HOME

If possible, provide a sample gist or screenshot:

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If possible, provide the log files

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