Fix default configuration settings.

- The current config file layout cannot be serialized to TOML with serde,
  so switch to YAML.  This necessitates updating to an unreleased
  version of confy.  See: reujab#85, reujab#77, toml-rs/toml-rs#145,
  and toml-rs/toml-rs#407.
- Print out the location of the default config file upon creation fixes:
  reujab#73 and reujab#78.
- Set the default left prompt to *something* so the user isn't left
  scratching their head.
- Change the default icon set to Unicode so that this is usable out of
  the box with as few dependencies as possible.

Cargo.toml

@@ -17,7 +17,7 @@ serde = { version = "1.0", features = ["derive"] }
 chrono = "0.4"
 clap = "=3.0.0-beta.2"
 clap_derive = "=3.0.0-beta.2"
-confy = "0.4"
+confy = { git = "https://github.com/rust-cli/confy", features = [ "yaml_conf" ], default-features = false }
 dirs = "2"
 git2 = "0.13"
 hostname = "0.3"

readme.md

@@ -19,7 +19,7 @@ Since silver is not written in shell script, it should theoretically be compatib
 
 ### Icons
 
-To be able to use the custom icons (which are enabled by default), you must patch your font or install a pre-patched font from [Nerd Fonts](https://github.com/ryanoasis/nerd-fonts).
+To be able to use the custom icons (which are disabled by default), you must patch your font or install a pre-patched font from [Nerd Fonts](https://github.com/ryanoasis/nerd-fonts).
 
 ### Installation