website: move integrations to separate folder, separate sidebar and new URL, add URL redirect

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

website/integrations/services/sentry/index.md

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+---
+title: Sentry
+---
+
+## What is Sentry
+
+From https://sentry.io
+
+:::note
+Sentry provides self-hosted and cloud-based error monitoring that helps all software
+teams discover, triage, and prioritize errors in real-time.
+
+One million developers at over fifty thousand companies already ship
+better software faster with Sentry. Won’t you join them?
+:::
+
+## Preparation
+
+The following placeholders will be used:
+
+- `sentry.company` is the FQDN of the Sentry install.
+- `authentik.company` is the FQDN of the authentik install.
+
+Create an application in authentik. Create a SAML Provider with the following values
+
+- ACS URL: `https://sentry.company/saml/acs/<sentry organisation name>/`
+- Issuer: `authentik`
+- Service Provider Binding: `Post`
+- Audience: `https://sentry.company/saml/metadata/<sentry organisation name>/`
+
+Under *Advanced protocol settings*, set the following:
+
+- Signing Certificate: Select any certificate.
+- Property Mapping: Select all Managed Mappings
+
+## Sentry
+
+**This guide assumes you've installed Sentry using [getsentry/onpremise](https://github.com/getsentry/onpremise)**
+
+Navigate to Settings -> Auth, and click on Configure next to SAML2
+
+![](./auth.png)
+
+In authentik, get the Metadata URL by right-clicking `Download Metadata` and selecting Copy Link Address, and paste that URL into Sentry.
+
+On the next screen, input these Values
+
+- IdP User ID: `http://schemas.goauthentik.io/2021/02/saml/uid`
+- User Email: `http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress`
+- First Name: `http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name`
+
+After confirming, Sentry will authenticate with authentik, and you should be redirected back to a page confirming your settings.