docs: update GitLab links

CONTRIBUTING.md

@@ -61,7 +61,7 @@ To contribute:
 
 1. Create an issue describing the bug or enhancement you want to propose (select the right issue template).
 2. Make sure the issue has been reviewed and agreed.
-3. Create a Merge Request, from your **own** fork (see [forking workflow](https://docs.gitlab.com/ee/user/project/repository/forking_workflow.html) documentation).
+3. Create a Merge Request, from your **own** fork (see [forking workflow](https://docs.gitlab.com/user/project/repository/forking_workflow/) documentation).
    Don't hesitate to mark your MR as `Draft` as long as you think it's not ready to be reviewed.
 
 ### Git Commit Conventions

README.md

@@ -3,7 +3,7 @@
 This project builds a Docker image with an API able to retrieve an access token for a given project using google apis.
 
 
-It is aimed at being used in GitLab CI as a [service container](https://docs.gitlab.com/ee/ci/services/)
+It is aimed at being used in GitLab CI as a [service container](https://docs.gitlab.com/ci/services/)
 in order to decouple the image of your jobs and the way of retrieving a [GCP OAuth access token](https://developers.google.com/identity/protocols/oauth2).
 
 ## How to use
@@ -35,7 +35,7 @@ Retrieve authentication token using API.
 | Name                       | Description                                                                               | required              | 
 |----------------------------|-------------------------------------------------------------------------------------------|-----------------------|
 | `serviceAccount`           | Default Service Account to which impersonate with OpenID Connect authentication           | `false` |
-| `workloadIdentityProvider` | Default Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ee/ci/cloud_services/google_cloud/) | `false` |
+| `workloadIdentityProvider` | Default Workload Identity Provider associated with GitLab to [authenticate with OpenID Connect](https://docs.gitlab.com/ci/cloud_services/google_cloud/) | `false` |
 | `envType`                  | The to-be-continuous environment type to retrieve associated Service Account and Workload Identity Provider values (one of `review`, `integration`, `staging` or `production`).<br/>_Only when `serviceAccount` and `workloadIdentityProvider` are not specified_ | `false` |
 
 ##### How are implicitly determined `serviceAccount` and `workloadIdentityProvider` values?
@@ -52,7 +52,7 @@ When not explicitly set, `serviceAccount` and `workloadIdentityProvider` values
 
 ##### How is guessed `envType`?
 
-When not explicitly set, `envType` is automatically guessed based on [GitLab predefined variables](https://docs.gitlab.com/ee/ci/variables/predefined_variables.html):
+When not explicitly set, `envType` is automatically guessed based on [GitLab predefined variables](https://docs.gitlab.com/ci/variables/predefined_variables/):
 
 | `$CI_COMMIT_REF_NAME` | `envType` value |
 | --------------------- | --------------- |