Robotics: reformat the home page organization section

The mentor for this issue is @geoffreynyaga

Background

1. The How this documentation is organized section on the Robotics Documentation home page is displayed as a card-style table. This interrupts the page layout. Reformat the section as a list, following these documentation home-page examples:

• Multipass: How this documentation is organized
• Anbox Cloud: How this documentation is organised

2. The heading (i.e How this documentation is organized) should also be a level-2 heading.

Prerequisites

Basic familiarity with reStructuredText (reST) and Git is required.

What you will learn

• How to edit reST source files.
• How Canonical documentation home pages are structured.
• How to contribute a documentation change through Git and GitHub.

Task

1. In the canonical/robotics_documentation repository, update docs/index.rst.
2. Replace the card-style list-table under How this documentation is organized with a list view.
3. Change How this documentation is organized to a level-2 heading.
4. Use the linked Multipass and Anbox Cloud pages as formatting references.
5. Open a pull request against the repository and sign the Canonical contributor license agreement.

Outcome

The Robotics Documentation home page displays its documentation types in a readable list, and the section heading is level 2.

Resources

• Robotics Documentation source file
• Multipass documentation example
• Anbox Cloud documentation example