Drop "unrolled/render" package (#23965)

None of the features of `unrolled/render` package is used. 

The Golang builtin "html/template" just works well. Then we can improve
our HTML render to resolve the "$.root.locale.Tr" problem as much as
possible.

Next step: we can have a template render pool (by Clone), then we can
inject global functions with dynamic context to every `Execute` calls.
Then we can use `{{Locale.Tr ....}}` directly in all templates , no need
to pass the `$.root.locale` again and again.

modules/context/context.go

@@ -42,14 +42,13 @@ import (
 	"gitea.com/go-chi/session"
 	chi "github.com/go-chi/chi/v5"
 	"github.com/minio/sha256-simd"
-	"github.com/unrolled/render"
 	"golang.org/x/crypto/pbkdf2"
 )
 
 // Render represents a template render
 type Render interface {
 	TemplateLookup(tmpl string) *template.Template
-	HTML(w io.Writer, status int, name string, binding interface{}, htmlOpt ...render.HTMLOptions) error
+	HTML(w io.Writer, status int, name string, data interface{}) error
 }
 
 // Context represents context of a request.