docs: 2x2 solutions grid, remove Resources section, reorder Reference section

[mindapivessa]

Summary

• Changed solutions CardGroup from 3 columns to 2 columns (2x2 grid layout)
• Removed "Solutions" heading
• Removed Resources section (Funding/Growth links)
• Reordered Reference section: Builder Codes → Base Contracts → Smart Contracts → Configuration → Glossary
• Moved Troubleshooting Transactions under Transactions in Core Primitives
• Added contribution guidelines and icon assets
• Moved content-guidelines.md and mintlify-reference.md into docs/

Test plan

• Verify home page renders 2x2 card grid
• Confirm Resources section no longer appears
• Verify Reference section ordering in sidebar
• Verify Troubleshooting Transactions appears under Transactions
• Check dark mode styling

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[mintlify]

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[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1