docs: optimize performance and enhance testing coverage

- Remove `pprof.Register(router)` from README.md and _example/custom/server.go

Signed-off-by: appleboy <appleboy.tw@gmail.com>

Author: appleboy

README.md

@@ -68,7 +68,6 @@ import (
 
 func main() {
   router := gin.Default()
-  pprof.Register(router)
   adminGroup := router.Group("/admin", func(c *gin.Context) {
     if c.Request.Header.Get("Authorization") != "foobar" {
       c.AbortWithStatus(http.StatusForbidden)

_example/custom/server.go

@@ -9,7 +9,6 @@ import (
 
 func main() {
 	router := gin.Default()
-	pprof.Register(router)
 	adminGroup := router.Group("/admin", func(c *gin.Context) {
 		if c.Request.Header.Get("Authorization") != "foobar" {
 			c.AbortWithStatus(http.StatusForbidden)