Issue#2706: add the required documentation update steps post v0.13 release

[devskillz47]

• updated release_process.md documentation to include 2 additional steps post release:
  - update the installation instructions in v0.13 documentation to point to the v0.13 release artifacts
  - update the tremor-runtime/readme.md file references to point to the newly created documentation version (v0.13) and
  artifacts

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.35%. Comparing base (bf45641) to head (0389d83).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2707      +/-   ##
==========================================
+ Coverage   91.33%   91.35%   +0.01%     
==========================================
  Files         309      309              
  Lines       60380    60380              
==========================================
+ Hits        55150    55161      +11     
+ Misses       5230     5219      -11     

Flag	Coverage Δ
e2e-command	11.25% <ø> (ø)
e2e-integration	50.44% <ø> (+0.18%)	⬆️
e2e-unit	12.54% <ø> (ø)
e2etests	52.76% <ø> (+0.18%)	⬆️
tremorapi	14.73% <ø> (+0.25%)	⬆️
tremorcodec	63.96% <ø> (ø)
tremorcommon	63.04% <ø> (ø)
tremorconnectors	28.75% <ø> (-0.01%)	⬇️
tremorconnectorsaws	11.22% <ø> (ø)
tremorconnectorsazure	4.67% <ø> (ø)
tremorconnectorsgcp	25.31% <ø> (ø)
tremorconnectorsobjectstorage	0.06% <ø> (ø)
tremorconnectorsotel	12.52% <ø> (ø)
tremorconnectorstesthelpers	68.25% <ø> (ø)
tremorinflux	87.71% <ø> (ø)
tremorinterceptor	55.34% <ø> (ø)
tremorpipeline	31.06% <ø> (ø)
tremorruntime	47.12% <ø> (+0.02%)	⬆️
tremorscript	54.90% <ø> (ø)
tremorsystem	5.76% <ø> (ø)
tremorvalue	69.52% <ø> (ø)
unittests	89.21% <ø> (+<0.01%)	⬆️

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see 5 files with indirect coverage changes

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[Licenser]

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