Random improvements

[jbrichau]

• Fix Hotwire example to use show: instead of call: (makes this work on platforms that do no support full continuations)
• Improve the Welcome page a bit
• Set version to 3.5.9

[codecov]

Codecov Report

Attention: Patch coverage is 4.34783% with 22 lines in your changes missing coverage. Please review.

Project coverage is 49.09%. Comparing base (a982e66) to head (3242efd).
Report is 2 commits behind head on master.

Files	Patch %	Lines
...ingStarted.class/instance/renderExamplesStepOn..st	0.00%	10 Missing ⚠️
...arted.class/instance/renderDocumentationStepOn..st	0.00%	7 Missing ⚠️
...ckage/WAComponent.extension/instance/turboShow..st	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1432      +/-   ##
==========================================
+ Coverage   49.00%   49.09%   +0.08%     
==========================================
  Files        9116     9144      +28     
  Lines       80339    80567     +228     
==========================================
+ Hits        39371    39555     +184     
- Misses      40968    41012      +44     

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