implement welcome and help screens for better onboarding #51
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Added a help and welcome screen to Halloy.
This also simplifies our logic initially so we don't pass down a config error all the way to empty buffer.
The welcome screen will be displayed if there's no configuration file found, and then guide the user through a few steps to set it up. The help screen will displayed as soon as something is wrong with the configuration file, and tell what went wrong.
If all is okay, we show dashboard.
closes #53