Improve icon settings

[Wolfr]

Makes the difference between SVG icons and Icon font feature more clear to explain. This config change will need to be reflected on the website.

Currently the icon font functionality is triggered by this config setting:

  icons: {
    generateIconFont: false,
    iconFontPath: "./content/scss/_icon-font.scss",
    svgIconClassPrefix: 'o-svg-icon',
    iconFontClassPrefix: 'if'
  },

This is a mixup of different things, the svgIconClassPrefix has nothing to do with the generateIconFont and iconFontPath.

Proposal to simplify to

  /**
   *  Icon font
   *  Set up CSS class prefix
   */
  iconFont: {
    outputPath: "./content/postcss/icon-font.css",
    classPrefix: 'if'
  },
  /**
   *  SVG icons
   *  Set up CSS class
   */
  svgIcons: {
    classPrefix: 'o-svg-icon'
  },

Signed-off-by: Wolfr johan.ronsse@gmail.com

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