change from GA to private beta and remove from nav

Author: stayseesong

src/_data/sidenav/main.yml

@@ -278,8 +278,6 @@ sections:
     title: Integration Error Codes
   - path: /connections/rate-limits
     title: Rate Limits
-  - path: /connections/oauth
-    title: OAuth 2.0
 - section_title: Unify
   section:
   - path: /unify

src/api/public-api/index.md

@@ -41,7 +41,8 @@ Learn more about [GitHub's secret scanning program](https://docs.github.com/en/d
 
 ## OAuth 2.0
 
-You can authenticate and authorize the Public API using [OAuth 2.0](/docs/connections/oauth).
+> info ""
+> OAuth 2.0 is currently in private beta and is governed by Segment’s [First Access and Beta Preview Terms](https://www.twilio.com/en-us/legal/tos){:target="_blank"}.
 
 ## FAQs
 #### What should I do if I see a notification that my token was exposed?

src/connections/functions/source-functions.md

@@ -389,7 +389,8 @@ Copy and paste this URL into the upstream tool or service to send data to this s
 
 ## OAuth 2.0
 
-You can authenticate source functions with [OAuth 2.0](/docs/connections/oauth).
+> info ""
+> OAuth 2.0 is currently in private beta and is governed by Segment’s [First Access and Beta Preview Terms](https://www.twilio.com/en-us/legal/tos){:target="_blank"}.
 
 ## Source function FAQs
 

src/connections/oauth.md

@@ -6,7 +6,7 @@ hidden: false
 OAuth 2.0 is an online authorization standard that uses tokens to grant access to API resources like Segment’s tracking API. You can use OAuth 2.0 as a security requirement for connections to third-party tools. 
 
 > info ""
-> OAuth 2.0 only supports server to Segment communication, a machine-to-machine workflow. Take a look at the [supported sources](#supported-sources) to see what sources Segment supports.
+> OAuth 2.0 is currently in private beta and is governed by Segment’s [First Access and Beta Preview Terms](https://www.twilio.com/en-us/legal/tos){:target="_blank"}. OAuth 2.0 only supports server to Segment communication, a machine-to-machine workflow. Take a look at the [supported sources](#supported-sources) to see what sources Segment supports.
 
 ## Permissions 
 Depending on your workspace permissions, your access to OAuth apps is limited.