Provide documentation about css classes & styling

[hendrikebbers]

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👾 Description of the issue

The PR #13 introduced custom style classes for the documentation. We need to provide a documentation of such classes (and some common asciidoc basic classes) that can be used in the documentation.

📋 Step by Step

To solve this issue and contribute a fix you should check the following step-by-step list. A more detailed documentation of the workflow can be found here.

• Claim this issue: Comment below.
• Fork the repository in github by simply clicking the 'fork' button.
• Check out the forked repository
• Create a feature branch for the issue. We do not have any naming definition for branches.
• Commit your changes.
• Start a Pull Request.
• Done 👍 Ask in comments for a review :)
• If the reviewer find some missing peaces or a problem he will start a discussion with you and describe the next steps how the problem can be solved.
• You did it 🎉 We will merge the fix in the master branch.
• Thanks, thanks, thanks for being part of this project as an open source contributor ❤️

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🤔❓ Questions

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