Rebrand: apply Redkey brand kit to logos, images, and CSV icon

[albertompe]

Summary

Replaces the legacy Redkey logos with the approved brand kit across the operator and Robin, and fixes the -color logo variants so the key syllable and Operator descriptor stay readable on dark backgrounds by recoloring them to the hexagon blue.

Changes

Assets

• Removed legacy redkey-logo-* images from docs/images/ (operator: -128/256/512/2048; Robin: -256/512) and the stale docs/proposals/images/redkey-logo.png.
• Added brand-kit assets:
  • Operator README banner: redkey-horizontal-operator-color-2000.png
  • Robin README banner: redkey-horizontal-color-2000.png (non-operator variant)
  • In-doc icons: redkey-icon-color-128.png / redkey-icon-color-256.png
• Operator only: vendored the full brand kit under docs/brand-kit/ for reference.

Documentation references

• Updated all README/docs/charts references to the new brand assets.
• Repointed the broken proposal image reference to the new icon.

CSV / OLM bundle icon

• Replaced the operator CSV icon with redkey-icon-color.svg (base64), switching mediatype to image/svg+xml in both the base and generated bundle CSVs.

Brand color fix (-color variants)

• Recolored the key syllable (#0B1F3A) and Operator descriptor (#263238) to Kubernetes Blue #326CE5 (the hexagon color) so they render correctly on dark backgrounds.
• Applied to master SVGs (wordmark, horizontal, horizontal-operator, stacked, stacked-operator), the 05-guidelines artwork (brand-overview, clear-space), and the redkey-og-white social card; all PNG exports regenerated at their original dimensions.
• Only logo glyphs (<path>) were recolored — dark background panels (<rect>) and caption/heading text were left untouched.
• Left intentionally unchanged: -black (monochrome) variants, -reverse/og-dark (white-on-dark), and color-palette swatches.

Brand documentation alignment

• Updated docs/brand-kit README.md color table, redkey-brand.css token comments, and asset-manifest.json (colorUsage) to reflect blue as the key/Operator color.

Licensing (REUSE)

• Replaced per-file logo entries with branding globs (docs/brand-kit/**, docs/images/redkey-icon-*.png, docs/images/redkey-horizontal-*.png) and removed stale entries.

Validation

• reuse lint: compliant on both repos (operator 316/316, Robin 99/99).
• CSV YAML validated; icon base64 decodes to a valid SVG with mediatype: image/svg+xml.
• Visual checks of banners and guidelines on light and dark backgrounds.

Notes

• operator-sdk bundle validate not run locally (tool not installed); the bundle CSV was edited in sync with the base and its YAML validated.