Create specification for required config variables

[Descent098]

Reasoning

Example

required_config:
  avatar:
    type: str
    default: "https://example.com"
    description: "This is a link to an avatar image"

This would mean when using the theme to init a project there will be the following parameters added to config.yml

... # Other code
avatar: "https://example.com" # This is a link to an avatar image
...

Requirements

• Ability to specify required variable, if no type is specified str is assumed
• implement functionality for other attributes
  • Default
  • Description
• Implement sensible defaults for attributes (default and description)
• Allow for description to not be required
• allow for default to not be required
• Check in ezcv.core.generate_site() before generating
• Use in ezcv.cli.init() when generating config.yml
• ignore name and theme
• Add to existing themes
  • Dimension
  • Qu-UP ezcv themes

Docs

• Guide for creating your own theme with this included
• Adding a notice that this won't generate when using ezcv theme -m
• Document behaviour when default or description is not provided
• Document behaviour for default and description
  • Default is used in site generation as the default value in config.yml
  • Description is added as a comment after default
  • ignores name and theme