feat(config): allow users to define config dir

This commit introduces a change to allow users to set a custom
configuration directory for Komorebi to address concerns about $HOME
getting cluttered.

The custom directory can be set with the environment variable
$Env:KOMOREBI_CONFIG_HOME (this should probably be done in $PROFILE).

If this variable is not set, komorebi will default to using
the $HOME directory.

resolve #61

komorebic/Cargo.toml

@@ -19,6 +19,7 @@ color-eyre = "0.5"
 dirs = "4"
 fs-tail = "0.1"
 heck = "0.4"
+lazy_static = "1"
 paste = "1"
 powershell_script = "0.2"
 serde = { version = "1", features = ["derive"] }