docs: add linkedin guide (#7600)

* docs: add linkedin guide

* docs: change pictures and settings

docs/docs/guides/integrate/identity-providers/_custom_login_policy.mdx

@@ -5,7 +5,7 @@ Organization: Choose the organization in the menu and go to $YOUR-DOMAIN/ui/cons
 
 1. Go to the Settings
 2. Modify your login policy in the menu "Login Behavior and Security"
-3. Enable the attribute "External IDP allowed"
+3. Enable the attribute "External Login allowed"
 
 You can also change the settings through the API directly either in the default settings or on a specific organization:
 - [Update Default Login Settings](/docs/apis/resources/admin/admin-service-update-login-policy)

docs/docs/guides/integrate/identity-providers/_generic_oauth.mdx

@@ -0,0 +1,12 @@
+The Generic OAuth Provider allows you to configure any OAuth compliant identity providers.
+
+The following information you need to fill out by yourself:
+
+<li><b>Name</b> {props.name}</li>
+<li><b>Authorization Endpoint</b> {props.authendpoint}</li>
+<li><b>Token Endpoint</b> {props.tokenendpoint}</li>
+<li><b>User Endpoint</b> {props.userendpoint}</li>
+<li><b>ID Attribute</b> {props.id}</li>
+<li><b>Client-ID</b> {props.clientid}</li>
+<li><b>Client-Secret</b> {props.clientid}</li>
+<li><b>Scopes</b>: (openid, profile, email is preconfigured)</li>

docs/docs/guides/integrate/identity-providers/linkedin_oauth.mdx

@@ -0,0 +1,81 @@
+---
+title: Configure LinkedIn as an OAuth Identity Provider in ZITADEL
+sidebar_label: LinkedIn generic OIDC
+id: linkedin-oauth
+---
+
+import GeneralConfigDescription from './_general_config_description.mdx';
+import Intro from './_intro.mdx';
+import CustomLoginPolicy from './_custom_login_policy.mdx';
+import IDPsOverview from './_idps_overview.mdx';
+import GenericOAuth from './_generic_oauth.mdx';
+import Activate from './_activate.mdx';
+import PrefillAction from './_prefill_action.mdx';
+import TestSetup from './_test_setup.mdx';
+
+<Intro provider="LinkedIn"/>
+
+## LinkedIn Configuration
+
+### Register a new client
+
+1. Go to the LinkedIn Developer console and create a new App: https://www.linkedin.com/developers/apps/new
+2. Add your App Name, your Company Page and a Logo
+3. Add "Sign In with LinkedIn using OpenID Connect" by clicking "Request access"
+4. Go to the Auth Settings of the App and add the following URL to the "Authorized redirect URLs"
+ - {your-domain}/ui/login/login/externalidp/callback
+ - Example redirect url for the domain `https://acme.zitadel.cloud` would look like this:  `https://acme.zitadel.cloud/ui/login/login/externalidp/callback`
+5. Verify the app as your company
+6. In the Auth - OAuth 2.0 scopes section you should see `openid`, `profile` and `email` listed
+7. Save Client ID and Primary Client Secret from the Application credentials
+
+![Add new Application in LinkedIn](/img/guides/linkedin_add_app.png)
+
+## ZITADEL Configuration
+
+### Add custom login policy
+
+<CustomLoginPolicy/>
+
+### Go to the IdP Providers Overview
+
+<IDPsOverview templates="Generic OAuth"/>
+
+### Create a new Generic OAuth Provider
+
+<GenericOAuth
+    name=": e.g. LinkedIn"
+    authendpoint="https://www.linkedin.com/oauth/v2/authorization"
+    tokenendpoint="https://www.linkedin.com/oauth/v2/accessToken"
+    userendpoint="https://api.linkedin.com/v2/userinfo"
+    id="sub"
+    clientid=": Client id from the application previously created in your LinkedIn account"
+    clientsecret=": Client Secret from the application previously created in your LinkedIn account"
+/>
+
+
+<GeneralConfigDescription provider_account="LinkedIn account" />
+
+![LinkedIn Provider](/img/guides/zitadel_linkedin_create_provider.png)
+
+### Activate IdP
+
+<Activate/>
+
+![Activate the LinkedIn Provider](/img/guides/zitadel_activate_linkedin.png)
+
+## Test the setup
+
+<TestSetup loginscreen="your LinkedIn login"/>
+
+![LinkedIn Button](/img/guides/zitadel_login_linkedin.png)
+
+![LinkedIn Login](/img/guides/linkedin_login.png)
+
+## Optional: Add ZITADEL action to autofill userdata
+
+<PrefillAction fields="firstname, lastname, username, email and email verified" provider="LinkedIn"/>
+
+```js reference
+https://github.com/zitadel/actions/blob/main/examples/linkedin_identity_provider.js
+```

docs/sidebars.js

@@ -344,12 +344,13 @@ module.exports = {
             "guides/integrate/identity-providers/apple",
             "guides/integrate/identity-providers/ldap",
             "guides/integrate/identity-providers/openldap",
-            "guides/integrate/identity-providers/migrate",
             "guides/integrate/identity-providers/okta-oidc",
             "guides/integrate/identity-providers/okta-saml",
             "guides/integrate/identity-providers/keycloak",
+            "guides/integrate/identity-providers/linkedin-oauth",
             "guides/integrate/identity-providers/mocksaml",
             "guides/integrate/identity-providers/jwt-idp",
+            "guides/integrate/identity-providers/migrate",
             "guides/integrate/identity-providers/additional-information",
           ],
         },