Move project-specific configuration outside the main development

[enridaga]

Tasks:

• VERSIONING.md (should be generated by the framework)
• repositories.txt (should become part of the instance-specific YAML configuration file)
• README.md to be reworked
• index.md (should be configurable or instance-specific)
• _config.yml (should only include generic configuration, instance specific to be moved to _config-local.yml)

[enridaga]

Make the list of instance-specific files and configuration parameters

[enridaga]

We need to assess the content inside folders