Add discovery landing page for content/authentication (#60031)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: subatoi <32935794+subatoi@users.noreply.github.com>
Co-authored-by: Joe Clark <31087804+jc-clark@users.noreply.github.com>

Author: 3 people

content/authentication/authenticating-with-a-passkey/about-passkeys.md

@@ -7,6 +7,8 @@ versions:
   ghec: '*'
   ghes: '*'
 shortTitle: About passkeys
+category:
+  - Learn about authentication
 ---
 
 {% data reusables.passkeys.ghes-disable %}

content/authentication/authenticating-with-a-passkey/managing-your-passkeys.md

@@ -7,6 +7,8 @@ versions:
   ghec: '*'
   ghes: '*'
 shortTitle: Manage your passkeys
+category:
+  - Sign in with SSO or a passkey
 contentType: how-tos
 ---
 

content/authentication/authenticating-with-a-passkey/signing-in-with-a-passkey.md

@@ -7,6 +7,8 @@ versions:
   ghec: '*'
   ghes: '*'
 shortTitle: Sign in with a passkey
+category:  
+  - Sign in with SSO or a passkey
 contentType: how-tos
 ---
 

content/authentication/authenticating-with-single-sign-on/about-authentication-with-single-sign-on.md

@@ -9,6 +9,8 @@ redirect_from:
 versions:
   ghec: '*'
 shortTitle: Single sign-on
+category:
+  - Learn about authentication
 ---
 ## About authentication with SSO
 

content/authentication/authenticating-with-single-sign-on/authenticating-with-a-managed-user-account.md

@@ -8,6 +8,8 @@ redirect_from:
 versions:
   ghec: '*'
 allowTitleToDifferFromFilename: true
+category:
+  - Sign in with SSO or a passkey
 ---
 
 If you use a {% data variables.enterprise.prodname_managed_user %}, you must authenticate through your identity provider (IdP) to access {% data variables.product.prodname_dotcom %}. The location where you can authenticate depends on whether your enterprise uses SAML or OIDC authentication.

content/authentication/authenticating-with-single-sign-on/authorizing-a-personal-access-token-for-use-with-single-sign-on.md

@@ -10,6 +10,8 @@ redirect_from:
 versions:
   ghec: '*'
 shortTitle: '{% data variables.product.pat_generic_caps %} with SSO'
+category:
+  - Sign in with SSO or a passkey
 ---
 You must authorize your {% data variables.product.pat_v1 %} after creation before the token can access an organization that uses SAML single sign-on (SSO). Access to `internal` resources (repositories, projects, and packages) in an enterprise requires an SSO authorization for an organization within an enterprise. For more information about creating a new {% data variables.product.pat_v1 %}, see [AUTOTITLE](/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token). {% data variables.product.pat_v2_caps %}s are authorized during token creation, before access to the organization is granted.
 

content/authentication/authenticating-with-single-sign-on/authorizing-an-app-for-single-sign-on.md

@@ -4,6 +4,8 @@ intro: 'To use an {% data variables.product.prodname_oauth_app %} or {% data var
 versions:
   ghec: '*'
 shortTitle: Apps and SSO
+category:
+  - Sign in with SSO or a passkey
 ---
 
 ## About authorizing apps with SSO

content/authentication/authenticating-with-single-sign-on/authorizing-an-ssh-key-for-use-with-single-sign-on.md

@@ -10,6 +10,8 @@ redirect_from:
 versions:
   ghec: '*'
 shortTitle: SSH Key with SSO
+category:
+  - Sign in with SSO or a passkey
 ---
 
 ## About authorization of SSH keys

content/authentication/authenticating-with-single-sign-on/viewing-and-managing-your-active-sso-sessions.md

@@ -9,6 +9,8 @@ redirect_from:
 versions:
   ghec: '*'
 shortTitle: Active SSO sessions
+category:
+  - Sign in with SSO or a passkey
 contentType: how-tos
 ---
 

content/authentication/connecting-to-github-with-ssh/about-ssh.md

@@ -9,6 +9,8 @@ versions:
   fpt: '*'
   ghes: '*'
   ghec: '*'
+category:
+  - Learn about authentication
 ---
 
 {% data reusables.ssh.about-ssh %} For more information about SSH, see [Secure Shell](https://en.wikipedia.org/wiki/Secure_Shell) on Wikipedia.