Make version part of config

cmd/backend/config.go

@@ -27,6 +27,7 @@ type Config struct {
 	PicsDir      string
 	Port         string
 	Title        string
+	Version      string
 	WebDir       string
 	MaxImgHeight int
 	MaxImgWidth  int
@@ -47,6 +48,7 @@ func newConfig() *Config {
 		PDFDir:       "/var/www/cpolis/pdfs",
 		PicsDir:      "/var/www/cpolis/pics",
 		Port:         ":8080",
+		Version:      "v0.13.0",
 		WebDir:       "/var/www/cpolis/web",
 	}
 }