feat: more docs to backstage.io

docs/auth/add-auth-provider.md

@@ -1,4 +1,7 @@
-# Adding authentication providers
+---
+id: add-auth-provider
+title: Adding authentication providers
+---
 
 ## Passport
 

docs/auth/auth-backend.md

@@ -0,0 +1,6 @@
+---
+id: auth-backend
+title: Auth backend
+---
+
+## TODO

docs/auth/glossary.md

@@ -1,4 +1,7 @@
-# Glossary
+---
+id: glossary
+title: Glossary
+---
 
 - **Popup** - A separate browser window opened on top of the previous one.
 - **OAuth** - More specifically OAuth 2.0, a standard protocol for

docs/auth/index.md

@@ -1,4 +1,7 @@
-# User Authentication and Authorization in Backstage
+---
+id: index
+title: User Authentication and Authorization in Backstage
+---
 
 ## Summary
 

docs/auth/oauth.md

@@ -1,4 +1,7 @@
-# OAuth and OpenID Connect
+---
+id: oauth
+title: OAuth and OpenID Connect
+---
 
 This section describes how Backstage allows plugins to request OAuth Access
 Tokens and OpenID Connect ID Tokens on behalf of the user, to be used for auth