docs: remove emphasis on Docker

# GitLab CI template for Docker

This project implements a GitLab CI/CD template to build, check and inspect your containers with [Docker](https://www.docker.com/).

This project implements a GitLab CI/CD template to build, test and secure your container images out of a `Dockerfile`.

It supports [kaniko](https://github.com/GoogleContainerTools/kaniko), [Buildah](https://buildah.io/) or [Docker](https://www.docker.com/) as build tools.

## Usage

    documentation: ./README.md

    changelog: ./CHANGELOG.md

data:

    description: "Build, check and inspect your containers with Docker"

    description: "Build, test and secure your container images out of a Dockerfile"

    public: true

    labels:

    - to be continuous

{

  "name": "Docker",

  "description": "Build, check and inspect your containers with [Docker](https://www.docker.com/)",

  "description": "Build, test and secure your container images out of a `Dockerfile`",

  "template_path": "templates/gitlab-ci-docker.yml",

  "kind": "package",

  "prefix": "docker",