Removed reference to IcePanel

[trmartin4]

🎟️ Tracking

📔 Objective

Removed references to IcePanel as we no longer use that service for architectural diagrams.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation
  team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed
  issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[cloudflare-workers-and-pages]

Deploying contributing-docs with    Cloudflare Pages

Latest commit:	e092311
Status:	✅  Deploy successful!
Preview URL:	https://0bcc13e0.contributing-docs.pages.dev
Branch Preview URL:	https://remove-icepanel.contributing-docs.pages.dev

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[github-actions]

Checkmarx One – Scan Summary & Details – f58ec666-2c99-4765-9a84-4590a7892244

No New Or Fixed Issues Found