fix(shorebird_cli): refer to https://console.shorebird.dev for account creation

[nilsreichardt]

Description

The CLI suggested using shorebird account create to create an account if no account could be found. However, since version 0.11.0, there is no shorebird account create anymore. I replaced shorebird account create with "https://console.shorebird.dev" to create an account.

Fixes #1234 (lol, nice ticket number)

(I don't know if this is the correct fix, feel free to close this PR)

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

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (d326fab) 98.92% compared to head (ddf9433) 98.92%.

❗ Current head ddf9433 differs from pull request most recent head 44414fd. Consider uploading reports for the commit 44414fd to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1235   +/-   ##
=======================================
  Coverage   98.92%   98.92%           
=======================================
  Files         179      179           
  Lines        4565     4565           
=======================================
  Hits         4516     4516           
  Misses         49       49           

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

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...orebird_cli/lib/src/commands/login_ci_command.dart	100.00% <100.00%> (ø)
...ges/shorebird_cli/lib/src/shorebird_validator.dart	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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