docs: resolve broken links

    * must use the [`resource_group`](https://docs.gitlab.com/ee/ci/yaml/#resource_group) feature to prevent multiple

      pipelines deploying to the same environment at the same time

    * must propagate the `$CI_ENVIRONMENT_URL` variable as a `environment_url.txt` artifact file (legacy way)

    * must propagate deployed environment information as [dotenv artifacts](https://docs.gitlab.com/ee/ci/pipelines/job_artifacts.html#artifactsreportsdotenv) (the _dotenv_ way):

    * must propagate deployed environment information as [dotenv artifacts](https://docs.gitlab.com/ee/ci/yaml/artifacts_reports.html#artifactsreportsdotenv) (the _dotenv_ way):

        * `environment_type`: the type of environment (`review`, `integration`, `staging` or `production`),

        * `environment_name`: the application name,

        * `environment_url`: set to `$CI_ENVIRONMENT_URL`.

* tests report integration using [JUnit test report](https://docs.gitlab.com/ee/ci/yaml/artifacts_reports.html#artifactsreportsjunit)

* auto-evaluating the environment url to test based on the presence of `$environment_url` (possibly propagated by an upstream deployment template

using [dotenv artifacts](https://docs.gitlab.com/ee/ci/pipelines/job_artifacts.html#artifactsreportsdotenv)) or a `environment_url.txt` file.

using [dotenv artifacts](https://docs.gitlab.com/ee/ci/yaml/artifacts_reports.html#artifactsreportsdotenv)) or a `environment_url.txt` file.

| Feature             | Description |

| ------------------- | ----------- |

| [cache](https://docs.gitlab.com/ee/ci/caching/) | Every template carefully implements optimized cache policy to speedup your pipeline execution. |

| [artifacts](https://docs.gitlab.com/ee/ci/pipelines/job_artifacts.html) | Every template implements optimized artifacts policy to keep only the bare necessities. |

| [artifacts](https://docs.gitlab.com/ee/ci/yaml/artifacts_reports.html) | Every template implements optimized artifacts policy to keep only the bare necessities. |

| [interruptible](https://docs.gitlab.com/ee/ci/yaml/#interruptible) | Every interruptible job implements the `interruptible` feature to allow cancelling the pipeline as soon as a newer one is triggered. |

| [code coverage](https://docs.gitlab.com/ee/ci/testing/code_coverage.html) | Every build&test job enforces code coverage computing (using the required build tools and options), and integration to GitLab (visible in merge requests and as a [badge](https://docs.gitlab.com/ee/ci/testing/code_coverage.html#pipeline-badges)). |

| [JUnit test reports](https://docs.gitlab.com/ee/ci/testing/unit_test_reports.html) | Every test job produces - whenever possible - a JUnit report, so that your test reports are automatically integrated to your pipelines and merge requests. |