default to ./web when Dir and WebFS are not set

update WebFS doc

Signed-off-by: Rui Yang <ruiya@vmware.com>
Co-authored-by: Aidan Oldershaw <aoldershaw@pivotal.io>

server/server.go

@@ -111,8 +111,10 @@ type WebConfig struct {
 	//
 	Dir string
 
-	// A file system includes web static. Will be overwritten by Dir
-	// It is expected to contain the directories as Dir.
+	// Alternative way to configure web static filesystem. Dir overrides this.
+	// It's expected to contain the same files and directories as mentioned
+	// above in Dir doc.
+	//
 	WebFS fs.FS
 
 	// Defaults to "( issuer URL )/theme/logo.png"

server/templates.go

@@ -79,6 +79,8 @@ func loadWebConfig(c webConfig) (http.Handler, http.Handler, *templates, error)
 	}
 	if c.dir != "" {
 		c.webFS = os.DirFS(c.dir)
+	} else if c.webFS == nil {
+		c.webFS = os.DirFS("./web")
 	}
 	if c.logoURL == "" {
 		c.logoURL = "theme/logo.png"