Add starship config and fix install commands.

starship/readme.md

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+## Usage
+
+```
+cp starship.toml ~/.config/
+```

starship/starship.toml

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+# Get editor completions based on the config schema
+"$schema" = 'https://starship.rs/config-schema.json'
+
+# Inserts a blank line between shell prompts
+add_newline = true
+
+format = """
+$username\
+$hostname\
+$directory\
+${custom.dcontrol}\
+$all
+"""
+
+# Replace the '❯' symbol in the prompt with '➜'
+[character] # The name of the module we are configuring is 'character'
+success_symbol = '[\$](bold green)' # The 'success_symbol' segment is being set to '➜' with the color 'bold green'
+error_symbol = '[\$](bold red)'
+
+[cmd_duration]
+disabled = true
+
+[custom.dcontrol]
+format='[\[$symbol $output\]]($style) '
+command = "echo $DOCKER_HOST"
+symbol=' '
+style="bold red"
+when = '[ "$DOCKER_HOST" != "" ]'
+
+[directory]
+truncation_length = 0
+format = '[$path]($style)[$read_only]($read_only_style)\] '
+
+[git_branch]
+format = '[\[$symbol $branch\]]($style) '
+symbol = ' '
+
+[golang]
+format = '[$symbol]($style)'
+
+[hostname]
+format = '[@$hostname$ssh_symbol:]($style)'
+style = 'yellow'
+ssh_only = false
+
+[package]
+disabled = true
+
+[ruby]
+format = '[$symbol]($style)'
+
+[username]
+format = '\[[$user]($style)'
+style_user = 'yellow'
+show_always = true