[BRANDING] Rebrand default meta tags

(cherry picked from commit b1a792b635)

modules/setting/ui.go

@@ -126,9 +126,9 @@ var UI = struct {
 		Description string
 		Keywords    string
 	}{
-		Author:      "Gitea - Git with a cup of tea",
-		Description: "Gitea (Git with a cup of tea) is a painless self-hosted Git service written in Go",
-		Keywords:    "go,git,self-hosted,gitea",
+		Author:      "Forgejo – Beyond coding. We forge.",
+		Description: "Forgejo is a self-hosted lightweight software forge. Easy to install and low maintenance, it just does the job.",
+		Keywords:    "git,forge,forgejo",
 	},
 }