replace huh with promptui

- it gives more control over filtering

add --filter/-f flag, this allows configuration over a prefix vs contains filter

update the README to reflect changes

filter.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"strings"
+
+	"github.com/spf13/viper"
+)
+
+// filterFunc returns a function that filters templates based on the specified filter type.
+func filterFunc(templates []string) func(input string, index int) bool {
+	switch viper.GetString("filter") {
+	case "contains":
+		return func(input string, index int) bool {
+			return strings.Contains(strings.ToLower(templates[index]), strings.ToLower(input))
+		}
+	default:
+		return func(input string, index int) bool {
+			return strings.HasPrefix(strings.ToLower(templates[index]), strings.ToLower(input))
+		}
+	}
+}