website/integrations: add zulip (#2106)

* add zulip to sidebar links

* added Zulip chat integration documentation

* fix markdown typo

* add note about using Post for saml binding

* added missing ACS info and cleaned up

format matches other integration documents

website/integrations/services/zulip/index.md

@@ -0,0 +1,72 @@
+---
+title: Zulip
+---
+
+## What is Zulip
+
+From https://zulip.com
+
+:::note
+**Zulip**: Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model.
+With Zulip, you can catch up on important conversations while ignoring irrelevant ones. 
+:::
+
+## Preperation
+
+The following placeholders will be used:
+
+- `authentik.company` is the FQDN of the authentik install.
+- `zulip.company` is the FQDN of the Zulip instance.
+
+Create an application in authentik and note the slug, as this will be used later. Create a SAML provider with the following parameters:
+
+- ACS URL: `https://zulip.company/complete/saml/`
+- Issuer: `https://authentik.company`
+- Service Provider Binding: `Post`
+- Signing Keypair: Select any certificate you have.
+- Property mappings: Select all Managed mappings.
+
+## Zulip Configuration
+
+Zulip is a Django application and is configured using `/etc/zulip/settings.py`. Only settings that differ
+from the defaults are displayed below. Please make sure you have the latest `settings.py` file as more settings 
+might have been added to defaults since you installed Zulip.
+
+Uncomment `zproject.backends.SAMLAuthBackend` inside the `AUTHENTICATION_BACKENDS` parameter to enable SAML support
+and fill in the following required configuration.
+
+```
+SOCIAL_AUTH_SAML_ORG_INFO = {
+    "en-US": {
+        "displayname": "authentik Zulip",
+        "name": "zulip",
+        "url": "{}{}".format("https://", EXTERNAL_HOST),
+    },
+}
+
+SOCIAL_AUTH_SAML_ENABLED_IDPS: Dict[str, Any] = {
+    # idp identifier and settings
+    "authentik": {
+       
+	    # KEEP OTHER SETTINGS AS DEFAULT OR CONFIGURE THEM ACCORDING TO YOUR PREFERENCES
+        "entity_id": "https://authentik.company",
+        "url": "https://authentik.company/application/saml/<application slug>/sso/binding/redirect/",
+        "display_name": "authentik SAML",
+    },
+}
+
+```
+
+Place the certificate you associated with the SAML provider in authentik inside the `/etc/zulip/saml/idps` directory. 
+The certificate file name must match the idp identifier name you set in the configuration (i.e. authentik.crt).
+
+:::note
+Remember to restart Zulip.
+:::
+## Additional Resources
+
+Please refer to the following for further information:
+
+- https://zulip.com/
+- https://zulip.readthedocs.io
+- https://chat.zulip.org/ (Official public Zulip Chat instance)

website/sidebarsIntegrations.js

@@ -42,6 +42,7 @@ module.exports = {
                 "services/wiki-js/index",
                 "services/wordpress/index",
                 "services/zabbix/index",
+                "services/zulip/index",
             ],
         },
         {