DOCS-2819: Update Tigera and Calico logos

[ctauchen]

DOCS-2819

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The favicon filename uses lowercase 'calico' but the actual file added is named with uppercase 'Calico-logo-2026-badge.png'. This case mismatch will cause the favicon to fail to load on case-sensitive file systems (e.g., Linux). Update to 'img/Calico-logo-2026-badge.png'.

Suggested change

	favicon: 'img/calico-logo-2026-badge.png',
	favicon: 'img/Calico-logo-2026-badge.png',