website/docs: manually set slug so release note URLs don't break

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

website/docs/releases/v0.10.md

@@ -1,5 +1,6 @@
 ---
 title: Release 0.10
+slug: "0.10"
 ---
 
 This update brings a lot of big features, such as:

website/docs/releases/v0.11.md

@@ -1,5 +1,6 @@
 ---
 title: Release 0.11
+slug: "0.11"
 ---
 
 This update brings these headline features:

website/docs/releases/v0.12.md

@@ -1,5 +1,6 @@
 ---
 title: Release 0.12
+slug: "0.12"
 ---
 
 This update brings these headline features:

website/docs/releases/v0.13.md

@@ -1,5 +1,6 @@
 ---
 title: Release 0.13 (passbook -> authentik)
+slug: "0.13"
 ---
 
 After a long back and forth, we've finally switched to a more permanent name. Whilst the upgrade is pretty much seamless, there are some things you have to change before upgrading.

website/docs/releases/v0.14.md

@@ -1,5 +1,6 @@
 ---
 title: Release 0.14
+slug: "0.14"
 ---
 
 ## Headline features

website/docs/releases/v0.9.md

@@ -1,5 +1,6 @@
 ---
 title: Release 0.9
+slug: "0.9"
 ---
 
 Due to some database changes that had to be rather sooner than later, there is no possibility to directly upgrade. You must extract the data before hand and import it again. It is recommended to spin up a second instance of authentik to do this.

website/docs/releases/v2021.1.md

@@ -1,5 +1,6 @@
 ---
 title: Release 2021.1
+slug: "2021.1"
 ---
 
 ## Headline Changes

website/docs/releases/v2021.2.md

@@ -1,5 +1,6 @@
 ---
 title: Release 2021.2
+slug: "2021.2"
 ---
 
 ## Headline Changes

website/docs/releases/v2021.3.md

@@ -1,5 +1,6 @@
 ---
 title: Release 2021.3
+slug: "2021.3"
 ---
 
 ## Headline Changes

website/docs/releases/v2021.4.md

@@ -1,5 +1,6 @@
 ---
 title: Release 2021.4
+slug: "2021.4"
 ---
 
 ## Headline Changes