Allow extra metadata on the repos section for rendering purposes

[coloboxp]

Id like to request a feature that I had to workaround using extra variables under env:

Would be ideal if each section under multirepo.repos had the possibility to store (and render) additional information:

• icon: An icon to represent one of the sections
• friendly_name: A short text that describes the section
• description: A summary of the content on that section

Example:

plugins:
  - macros:
      verbose: true
  - search
  - multirepo:
      # (optional) tells multirepo to cleanup the temporary directory after site is built.
      cleanup: true
      # if set the docs directory will not be removed when importing docs. When using this with a nav section in an imported repo
      # you must keep the docs directory in the path (e.g., docs/path/to/file.md).
      keep_docs_dir: true
      repos:
        - section: 'User Guide'
          import_url: ''
          friendly_name: 'User Guide
          icon: 'res/userguide.svg'
          description: 'Entry level documentation'
        - section: 'adm-hw'
          import_url: ''
          friendly_name: 'Administration'
          icon: 'res/administrator.jpg'
          description: 'Topics related to infrastructure, monitoring, and cluster administration'

If that extra metadata were made available to be used with the macros plugin, then could be useful to also render home or landing pages with a little bit more customization, ie:

![{icon}] **{friendly_name}** {description}	![{icon}] **{friendly_name}** {description}	[{icon}] **{friendly_name}** {description}
![{icon}] **{friendly_name}** {description}	![{icon}] **{friendly_name}** {description}	[{icon}] **{friendly_name}** {description}

Even nicer would be if there was an option to render such table by enabling it in configuration or calling a macro directly on a markdown file, ie:

[index.md]

# Home

{{ multirepo_toc() }}

Or similar