How to Route multiple php web pages on Dockerfile

I have three webpages

1) Index.php
2) Submit.php
3) nav.php

both shares the same navigation bar

(nav.php)

all these php files are considered as separate micro services and all three of them are separate Docker images . How can I include

<?php include("nav.php") ?>

in index.php as they are all in separate containerize Docker image and want to Deploy the web app on Gcloud using kubernetes Engine . I had deployed index.php on gcloud using kubernetes engine but index.php and nav.php was both in the same container but I want to seperate them just to practice how can I Deploy multiple webpages on multiple containers and use them as a single website