feat(shorebird_cli): link to support flutter version docs when using unsupported Flutter versions

[felangel]

Description

• feat(shorebird_cli): link to support flutter version docs when using unsupported Flutter versions

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore
• 🧪 Tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (86d58ec) to head (ce0dbb5).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2220   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          186       186           
  Lines         5792      5796    +4     
=========================================
+ Hits          5792      5796    +4     

Flag	Coverage Δ
shorebird_cli	100.00% <100.00%> (ø)

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