Fix: Remove readfile usages and replace with includes (#879)

Author: nginx-jack

content/includes/nginx-plus/nginx-openid-repo-note.txt renamed to content/includes/nginx-plus/nginx-openid-repo-note.md

@@ -16,7 +16,7 @@ See [Single Sign-On With Microsoft AD FS]({{< ref "nginx/deployment-guides/singl
 
 This guide explains how to enable single sign-on (SSO) for applications being proxied by F5 NGINX Plus. The solution uses OpenID Connect as the authentication mechanism, with [Microsoft Active Directory Federation Services](https://docs.microsoft.com/en-us/windows-server/identity/active-directory-federation-services) (AD FS) as the identity provider (IdP) and NGINX Plus as the relying party.
 
-{{< see-also >}}{{< readfile file="includes/nginx-openid-repo-note.txt" markdown="true" >}}{{< /see-also >}}
+{{< see-also >}}{{<include "nginx-plus/nginx-openid-repo-note">}}{{< /see-also >}}
 
 <span id="prereqs"></span>
 ## Prerequisites

content/nginx/deployment-guides/single-sign-on/oidc-njs/active-directory-federation-services.md

@@ -16,7 +16,7 @@ See [Single Sign-On With Auth0]({{< ref "nginx/deployment-guides/single-sign-on/
 
 You can use F5 NGINX Plus with [Auth0](https://auth0.com/) and OpenID Connect to enable single sign-on (SSO) for your proxied applications. By following the steps in this guide, you will learn how to set up SSO using OpenID Connect as the authentication mechanism, with Auth0 as the identity provider (IdP), and NGINX Plus as the relying party.
 
-{{< see-also >}}{{< readfile file="includes/nginx-openid-repo-note.txt" markdown="true" >}}{{< /see-also >}}
+{{< see-also >}}{{<include "nginx-plus/nginx-openid-repo-note">}}{{< /see-also >}}
 
 ## Prerequisites
 

content/nginx/deployment-guides/single-sign-on/oidc-njs/auth0.md

@@ -16,7 +16,7 @@ See [Single Sign-On With Amazon Cognito]({{< ref "nginx/deployment-guides/single
 
 This guide explains how to enable single sign‑on (SSO) for applications being proxied by F5 NGINX Plus. The solution uses OpenID Connect as the authentication mechanism, with [Amazon Cognito](https://aws.amazon.com/cognito/) as the identity provider (IdP), and NGINX Plus as the relying party.
 
-{{< see-also >}}{{< readfile file="includes/nginx-openid-repo-note.txt" markdown="true" >}}{{< /see-also >}}
+{{< see-also >}}{{<include "nginx-plus/nginx-openid-repo-note">}}{{< /see-also >}}
 
 
 <span id="prereqs"></span>

content/nginx/deployment-guides/single-sign-on/oidc-njs/cognito.md

@@ -16,7 +16,7 @@ See [Single Sign-On With Keycloak]({{< ref "nginx/deployment-guides/single-sign-
 
 This guide explains how to enable single sign-on (SSO) for applications being proxied by F5 NGINX Plus. The solution uses OpenID Connect as the authentication mechanism, with [Keycloak](https://www.keycloak.org/) as the identity provider (IdP), and NGINX Plus as the relying party.
 
-{{< see-also >}}{{< readfile file="includes/nginx-openid-repo-note.txt" markdown="true" >}}{{< /see-also >}}
+{{< see-also >}}{{<include "nginx-plus/nginx-openid-repo-note">}}{{< /see-also >}}
 
 
 <span id="prereqs"></span>

content/nginx/deployment-guides/single-sign-on/oidc-njs/keycloak.md

@@ -16,7 +16,7 @@ See [Single Sign-On With Okta]({{< ref "nginx/deployment-guides/single-sign-on/o
 
 You can use NGINX Plus with Okta and OpenID Connect to enable single sign-on (SSO) for your proxied applications. By following the steps in this guide, you will learn how to set up SSO using OpenID Connect as the authentication mechanism, with Okta as the identity provider (IdP), and NGINX Plus as the relying party.
 
-{{< see-also >}}{{< readfile file="includes/nginx-openid-repo-note.txt" markdown="true" >}}{{< /see-also >}}
+{{< see-also >}}{{<include "nginx-plus/nginx-openid-repo-note">}}{{< /see-also >}}
 
 ## Prerequisites
 

content/nginx/deployment-guides/single-sign-on/oidc-njs/okta.md

@@ -16,7 +16,7 @@ See [Single Sign-On With OneLogin]({{< ref "nginx/deployment-guides/single-sign-
 
 You can use NGINX Plus with [OneLogin](https://www.onelogin.com/) and the OpenID Connect protocol to enable single sign-on (SSO) for your proxied applications. By following the steps in this guide, you will learn how to set up SSO using OpenID Connect as the authentication mechanism, with OneLogin as the identity provider (IdP) and NGINX Plus as the relying party.
 
-{{< see-also >}}{{< readfile file="includes/nginx-openid-repo-note.txt" markdown="true" >}}{{< /see-also >}}
+{{< see-also >}}{{<include "nginx-plus/nginx-openid-repo-note">}}{{< /see-also >}}
 
 ## Prerequisites
 

content/nginx/deployment-guides/single-sign-on/oidc-njs/onelogin.md

@@ -18,7 +18,7 @@ This guide explains how to enable single sign-on (SSO) for applications being pr
 
 The instructions in this document apply to both Ping Identity's on‑premises and cloud products, PingFederate and PingOne for Enterprise.
 
-{{< see-also >}}{{< readfile file="includes/nginx-openid-repo-note.txt" markdown="true" >}}{{< /see-also >}}
+{{< see-also >}}{{<include "nginx-plus/nginx-openid-repo-note">}}{{< /see-also >}}
 
 <span id="prereqs"></span>
 ## Prerequisites