fix(demo): update Flowing Code's logo in demos

[paodb]

Close#138

New logo looks like this:

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (1)

• src/test/resources/META-INF/resources/frontend/images/applogo.png is excluded by !**/*.png

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch issue-138

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[mlopezFC]

LGTM