website/docs: prepare next release notes

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

website/docs/releases/v2021.8.md

@@ -0,0 +1,30 @@
+---
+title: Release 2021.8
+slug: "2021.8"
+---
+
+## Headline Changes
+
+- Embedded Outpost
+
+    To simplify the setup, an embedded outpost has been added. This outpost runs as part of the main authentik server, and requires no additional setup.
+
+    You can simply assign providers to the embedded outpost, and either use the integrations to configure reverse proxies, or point your traffic to the main authentik server.
+    Traffic is routed based on host-header, meaning every host that has been configured as a provider and is assigned to the embedded proxy will be sent to the outpost, and every sub-path under `/akprox` is sent to the outpost too. The rest is sent to authentik itself.
+
+
+## Minor changes
+
+- api: Add filters to resources which were missing them
+
+## Upgrading
+
+This release does not introduce any new requirements.
+
+### docker-compose
+
+Download the docker-compose file for 2021.7 from [here](https://raw.githubusercontent.com/goauthentik/authentik/version-2021.7/docker-compose.yml). Afterwards, simply run `docker-compose up -d`.
+
+### Kubernetes
+
+Upgrade to the latest chart version to get the new images.