fix: serve index.html for docs directory, update README with testing instructions

services/gateway/handlers/static.go

@@ -2,6 +2,8 @@ package handlers
 
 import (
 	"net/http"
+	"os"
+	"path"
 
 	"github.com/fiskerinc/cloud-services/pkg/utils/envtool"
 )
@@ -12,6 +14,23 @@ func DocsHandler() http.Handler {
 	if fp == "" {
 		return nil
 	}
-	fs := http.FileServer(http.Dir(fp))
-	return fs
+
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Get the requested path
+		reqPath := r.URL.Path
+		if reqPath == "" || reqPath == "/" {
+			reqPath = "/index.html"
+		}
+
+		// Build full file path
+		fullPath := path.Join(fp, reqPath)
+
+		// Check if it's a directory, serve index.html
+		info, err := os.Stat(fullPath)
+		if err == nil && info.IsDir() {
+			fullPath = path.Join(fullPath, "index.html")
+		}
+
+		http.ServeFile(w, r, fullPath)
+	})
 }