feat: Add Gruvbox Theme

[DarienMC]

Linked Issue

fix #126

Description

I added the following Marketplace source for the Gruvbox Theme in the sources-themes.ts file.

export const sourcesMarketplace: ThemeSource[] = [
  // ... Other existing themes
  ...generateMarketplaceSource(
    'jdinhlife.gruvbox',
    'https://github.com/jdinhify/vscode-theme-gruvbox/blob/main/package.json',
    [
      'Gruvbox Dark Hard',
      'Gruvbox Dark Medium',
      'Gruvbox Dark Soft',
      'Gruvbox Light Hard',
      'Gruvbox Light Medium',
      'Gruvbox Light Soft',
    ],
  ),
]

Then ran pnpm run fetch to retrieve the theme and then pnpm run play to test it.

In the playground, there are 6 additional themes available:

• Gruvbox Dark Hard
• Gruvbox Dark Medium
• Gruvbox Dark Soft
• Gruvbox Light Hard
• Gruvbox Light Medium
• Gruvbox Light Soft

Here is a a screenshot below demonstrating this:

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