Simplify resources code, enabling any resource to be overridden (not just translations)

resources/banner.go

@@ -0,0 +1,19 @@
+package resources
+
+import (
+	"fmt"
+	"strings"
+	"unicode"
+
+	"github.com/navidrome/navidrome/consts"
+)
+
+func loadBanner() string {
+	data, _ := Asset("banner.txt")
+	return strings.TrimRightFunc(string(data), unicode.IsSpace)
+}
+
+func Banner() string {
+	version := "Version: " + consts.Version()
+	return fmt.Sprintf("%s\n%52s\n", loadBanner(), version)
+}