go 1.16 features

- use go embed instead of go-binary and remove all about old assets (go 1.16 feature)
- pin gox version (go 1.16 feature)
- update ci to go 1.16

pkg/api/routes.go

@@ -20,8 +20,8 @@ func SetupMiddlewares(group *gin.RouterGroup) {
 func SetupRoutes(router *gin.Engine) {
 	root := router.Group(command.Opts.Prefix)
 
-	root.GET("/", GetHome)
-	root.GET("/static/*path", GetAsset)
+	root.GET("/", gin.WrapH(GetHome()))
+	root.GET("/static/*path", gin.WrapH(GetAssets()))
 	root.GET("/connect/:resource", ConnectWithBackend)
 
 	api := root.Group("/api")