Chore: Group auth docker blocks (#54274)

* Move auth docker images to parent folder

* Add README file for auth parent folder

* Add grafana-authnz-team as code owner

* Update `devenv` docs

devenv/README.md

@@ -35,7 +35,7 @@ make devenv sources=influxdb,prometheus,elastic5
 Some of the blocks support dynamic change of the image version used in the Docker file. The signature looks like this: 
 
 ```bash
-make devenv sources=postgres,openldap,grafana postgres_version=9.2 grafana_version=6.7.0-beta1
+make devenv sources=postgres,auth/openldap,grafana postgres_version=9.2 grafana_version=6.7.0-beta1
 ```
 
 

devenv/docker/blocks/auth/README.md

@@ -0,0 +1,32 @@
+# Auth Docker blocks
+
+This collection of Docker images will help create a developer environment to
+interact with different Authentication Providers.
+
+## Usage
+
+Spin up a service with the following command from the base directory of this
+repository.
+
+```bash
+make devenv=oauth
+```
+
+This will add the `oauth/docker-compose` block to the `docker-compose` file used
+by the `devenv` target.
+
+## Available Authentication Providers
+
+- [apache_proxy](./apache_proxy)
+- [apache_proxy_mac](./apache_proxy_mac)
+- [freeipa](./freeipa)
+- [jwt_proxy](./jwt_proxy)
+- [oauth](./oauth)
+- [nginx_proxy](./nginx_proxy)
+- [nginx_proxy_mac](./nginx_proxy_mac)
+- [oauth](./oauth)
+- [openldap](./openldap)
+- [openldap-mac](./openldap-mac)
+- [openldap-multiple](./openldap-multiple)
+- [prometheus_basic_auth_proxy](./prometheus_basic_auth_proxy)
+- [saml](./saml)