Small revision to nav structure of the contributor docs

Why?

Current contribution docs nav structure:

• How we work
  • The Docs Charter
  • Docs Meetings
  • Docs Workflow organization
• Contribute to improve and expand Docs articles
• Create a new documentation module
• Contributing to Quick Docs
• Contributing to Release Notes
• Contribution Tools
  • HowTo for casual contributions (for GitLab-based pages)
  • How to profoundly use GitLab UI for document maintenance
  • How to edit files on the Pagure Web UI
  • How to create and use a local Fedora authoring environment
  • How to run a local preview
  • How to check documentation style with Vale
  • Edit a single page in Forge
• The docs style guide
• AsciiDoc for Fedora
  • Markup
  • Reusable attributes
• Working with Translations
• Contribute to keeping docs up and running
  • Design the user interface for Docs

Possible new one:

• How we work
  • The Docs Charter
  • Docs Meetings
  • Docs Workflow organization
• Contribute to Docs
• Create a new documentation module
• Contributing to Quick Docs
• Contributing to Release Notes
• How to
  • Edit a single page in Forge
  • Edit locally
  • Check edits with Vale
• How to (legacy)
  • Edit a page in Pagure
  • Edit a page in GitLab
  • Make larger contributions in GitLab
  • Edit locally (repos hosted in Pagure and Gitlab)
• The docs style guide
• AsciiDoc for Fedora
  • Markup
  • Reusable attributes
• Working with Translations
• Contribute to keeping docs up and running
  • Design the user interface for Docs