Add version notes to docs (#1592)

docs/versioned_docs/version-0.15/10-intro.md

@@ -27,7 +27,7 @@ pipeline:
 
 - Define any Docker image as context
   - either use your own and install the needed tools in custom Docker images, or
-  - search [Docker Hub](https://hub.docker.com/search?type=image) for images that are already tailored for your needs) 
+  - search [Docker Hub](https://hub.docker.com/search?type=image) for images that are already tailored for your needs)
 - List the commands that should be executed in your container, in order to build or test your application
 
 ```diff
@@ -85,3 +85,8 @@ pipeline:
 ```
 
 See [plugin docs](./20-usage/51-plugins/10-plugins.md).
+
+## Continue reading
+
+- [Create a Woodpecker pipeline for your repository](./20-usage/10-intro.md)
+- [Setup your own Woodpecker instance](./30-administration/00-setup.md)

docs/versioned_docs/version-0.15/30-administration/00-setup.md

@@ -10,6 +10,12 @@ A Woodpecker deployment consists of two parts:
 >
 > You can add more agents to increase the number of parallel builds or set the agent's `WOODPECKER_MAX_PROCS=1` environment variable to increase the number of parallel builds for that agent.
 
+## Which version of Woodpecker should I use?
+
+Woodpecker is having two different kinds of releases: **stable** and **next**.
+
+To find out more about the differences between the two releases, please read the [FAQ](/faq).
+
 ## Installation
 
 You can install Woodpecker on multiple ways:

docs/versioned_docs/version-0.15/80-downloads.md

@@ -1,5 +1,11 @@
 # Downloads
 
+## Which version of Woodpecker should I use?
+
+Woodpecker is having two different kinds of releases: **stable** and **next**.
+
+To find out more about the differences between the two releases, please read the [FAQ](/faq).
+
 ## Binaries & DEB, RPM
 
 [Latest release](https://github.com/woodpecker-ci/woodpecker/releases/latest)