hubolib: Do not add missing trailing slash to command line baseURL

This makes it consistent with how it behaves when it's set in config.toml.

This commit also unifies BaseURL in Site.Info so we now have one source for this value.

Fixes #3262

commands/hugo.go

@@ -317,9 +317,6 @@ func InitializeConfig(subCmdVs ...*cobra.Command) (*deps.DepsCfg, error) {
 	config.Set("logI18nWarnings", logI18nWarnings)
 
 	if baseURL != "" {
-		if !strings.HasSuffix(baseURL, "/") {
-			baseURL = baseURL + "/"
-		}
 		config.Set("baseURL", baseURL)
 	}