Remove Jekyll config

docs/.gitignore

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-/Gemfile.lock

docs/Gemfile

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-source 'https://rubygems.org'
-gem 'github-pages', group: :jekyll_plugins

docs/_config.yml

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-theme: jekyll-theme-minimal
-title: SymfonyExtension
-description: "🎼 Integrates Behat with Symfony."
-repository: FriendsOfBehat/SymfonyExtension

docs/index.md

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-<p align="center">
-    <img src="https://avatars2.githubusercontent.com/u/20600343" /><br/>
-</p>
-
-<h1 align="center">SymfonyExtension</h1>
-
-This Behat extension provides an integration with Symfony (both `^3.4` and `^4.1`) and Mink driver for Symfony application.
-
-It allows for:
- 
- * defining your contexts as regular Symfony services
- 
- * autowiring and autoconfiguring your contexts
- 
- * testing your Symfony application without having to set up a server
- 
-## Documentation
-
- * [Installation](docs/installation.md)
- * [Usage](docs/usage.md)
- * [Mink integration](docs/mink_integration.md)
- * [Behat/Symfony2Extension differences](docs/bs2e_differences.md)
- * [Configuration reference](docs/configuration_reference.md)
- 
-## License
-
-This extension is completely free and released under permissive [MIT license](LICENSE).
-
-## Authors
-
-It is originally created by [Kamil Kokot](https://github.com/pamil). 
-See the list of [all contributors](https://github.com/FriendsOfBehat/SymfonyExtension/graphs/contributors).