Make small documentation updates

- remove guides section
- re-order some content
- fix some links
- remove duplicated ads

DOCUMENTATION/content/getting-started/index.md

@@ -8,7 +8,6 @@ weight: 2
 
 - [Git](https://git-scm.com/downloads)
 - [Docker](https://www.docker.com/products/docker/) `>= 17.12`
-- [gcloud](https://cloud.google.com/sdk/install) 
 
 
 
@@ -22,17 +21,6 @@ Choose the setup the best suits your needs.
  	- [A.2) Don't have a PHP project yet](#A2)
 - [B) Setup for Multiple Projects](#B)
 
-### Setup gcloud for docker registry
-
-```
-gcloud auth configure-docker
-```
-
-and login to gcloud for use the registry and auth the permission.
-
-```
-gcloud auth login
-```
 
 <a name="A"></a>
 ### A) Setup for Single Project