doc: merge unit tests/docker unit tests pages, simplfy, reword

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-## Running tests inside Docker containers
-
-Read first:
-
-- [Docker 101](docker/docker-101.md)
-- [Docker resources](docker/resources.md)
-- [Unit tests](Unit-tests.md)
-
-### Docker test images
-
-Test Dockerfiles are located under `tests/docker/<distribution>/Dockerfile`,
-and can be used to build Docker images to run Shaarli test suites under common
-Linux environments.
-
-Dockerfiles are provided for the following environments:
-
-- `alpine36` - [Alpine 3.6](https://www.alpinelinux.org/downloads/)
-- `debian8` - [Debian 8 Jessie](https://www.debian.org/DebianJessie) (oldstable)
-- `debian9` - [Debian 9 Stretch](https://wiki.debian.org/DebianStretch) (stable)
-- `ubuntu16` - [Ubuntu 16.04 Xenial Xerus](http://releases.ubuntu.com/16.04/) (LTS)
-
-What's behind the curtains:
-
-- each image provides:
-    - a base Linux OS
-    - Shaarli PHP dependencies (OS packages)
-    - test PHP dependencies (OS packages)
-    - Composer
-- the local workspace is mapped to the container's `/shaarli/` directory,
-- the files are rsync'd so tests are run using a standard Linux user account
-  (running tests as `root` would bypass permission checks and may hide issues)
-- the tests are run inside the container.
-
-### Building test images
-
-```bash
-# build the Debian 9 Docker image
-$ cd /path/to/shaarli
-$ cd tests/docker/debian9
-$ docker build -t shaarli-test:debian9 .
-```
-
-### Running tests
-
-```bash
-$ cd /path/to/shaarli
-
-# install/update 3rd-party test dependencies
-$ composer install --prefer-dist
-
-# run tests using the freshly built image
-$ docker run -v $PWD:/shaarli shaarli-test:debian9 docker_test
-
-# run the full test campaign
-$ docker run -v $PWD:/shaarli shaarli-test:debian9 docker_all_tests
-```