website/docs: add changelog for 2021.6

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

website/docs/releases/v2021.6.md

@@ -1,5 +1,6 @@
 ---
-title: Next
+title: Release 2021.6
+slug: "2021.6"
 ---
 
 ## Headline Changes
@@ -22,10 +23,23 @@ title: Next
 
     Now, authentik first checks if the current tenant has a default flow configured for the selected designation. If not, it behaves the same as before, meaning that if you want to select a default flow based on policy, you can just leave the tenant default empty.
 
+- Domain-level authorization with proxy providers
+
+    Instead of simply being able to toggle between forward auth and proxy mode, you can now enable forward auth for an entire domain. This has the downside that you can't do per-application authorization, but also simplifies configuration as you don't have to create each application in authentik.
+
+- API Schema now uses OpenAPI v3
+
+    The API endpoints are mostly the same, however all the clients are now built from an OpenAPI v3 schema. You can retrieve the schema from `authentik.company.tld/api/v2beta/schema/`
+
+- On Kubernetes installs without a /media PVC, you can now set URLs instead of uploading files.
+- Expanded prometheus metrics for PolicyEngine and FlowPlanner
+
 ## Minor changes
 
 - You can now specify which sources should be shown on an Identification stage.
 - Add UI for the reputation of IPs and usernames for reputation policies.
+- Fix proxy outpost not being able to redeem tokens when using with an un-trusted SSL Certificate
+- Add UI to check access of any application for any user
 
 ## Upgrading
 

website/sidebars.js

@@ -146,6 +146,7 @@ module.exports = {
             type: "category",
             label: "Release Notes",
             items: [
+                "releases/v2021.6",
                 "releases/v2021.5",
                 "releases/v2021.4",
                 "releases/v2021.3",