Fix country name labels

[rtaph]

This PR introduces a data dictionary containing the country name mappings between Altair, the obesity dataset, and the World Bank dataset. These are used to fix a join bug in the data cleaning stage.

[rtaph]

The other countries are back! But maybe at some stage we want to consider what to do about South Sudan. I'm also noticing there still is a join issue with Côte d'Ivoire.

[rtaph]

Altair geosjon objects that don't exist in our data:

• 'American Samoa',
• 'Andorra',
• 'Bermuda',
• 'British Virgin Islands',
• 'Cayman Islands',
• 'Dominica',
• 'Faroe Islands',
• 'Gibraltar',
• 'Greenland',
• 'Isle of Man',
• 'Kosovo',
• 'Liechtenstein',
• 'Marshall Islands',
• 'Monaco',
• 'Nauru',
• 'Northern Mariana Islands',
• 'Not classified',
• 'Palau',
• 'San Marino',
• 'Sint Maarten (Dutch part)',
• 'St. Kitts and Nevis',
• 'St. Martin (French part)',
• 'Turks and Caicos Islands',
• 'Tuvalu'

These are small jurisdictions anyway, so would not be visible.