refactor: Update starship.toml file path and add optional icon parameter in setup.sh

setup.sh

@@ -3,6 +3,41 @@
 # Exit immediately if a command exits with a non-zero status.
 set -e
 
+# Default icon value (empty if not provided)
+icon=""
+
+# Function to display script usage
+usage() {
+    echo "Usage: $0 [--icon <nerd font symbol>]"
+    exit 1
+}
+
+# Parse command-line options
+while getopts ":i:-:" opt; do
+    case $opt in
+        i)
+            icon="$OPTARG"
+            ;;
+        -)
+            case "${OPTARG}" in
+                icon=*)
+                    icon="${OPTARG#*=}"
+                    ;;
+                *)
+                    usage
+                    ;;
+            esac
+            ;;
+        :)
+            echo "Option -$OPTARG requires an argument."
+            usage
+            ;;
+        ?)
+            usage
+            ;;
+    esac
+done
+
 # Function to install Fish shell
 install_fish() {
     echo "Installing Fish shell..."