0.5.0 - Clean up stat boxes and remove other features

• cleaning up large stat boxes to match desktop ui a little more
• removing some concepts that don't exist in adguard

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• chore: bumps version to 0.5.0 by @gh-action-bump-version
• remove unique clients and remaining time concepts by @warmfire540
• remove diagnostic count concepts by @warmfire540
• remove system metrics graph functionality by @warmfire540
• stat boxes cleaned up, coloring to match desktop by @warmfire540

What's Changed

• Clean up stat boxes and remove other features by @warmfire540 in #5

Full Changelog: 0.4.0...0.5.0