docs: introduce blogpost of ArgoCD and Keptn integration

[odubajDT]

Changes

This PR introduces a blogpost about the possible future integration of Argo and Keptn. It describes how these two projects can collaborate and help the end user with faster and safer delivery of software

Part-of: #3356

[bacherfl]

nice work! left a couple of suggestions but looks good already

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.33%. Comparing base (e044b51) to head (6df8642).

❗ Current head 6df8642 differs from pull request most recent head 45ea026

Please upload reports for the commit 45ea026 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3521      +/-   ##
==========================================
- Coverage   85.38%   85.33%   -0.06%     
==========================================
  Files         167      167              
  Lines        7412     7412              
==========================================
- Hits         6329     6325       -4     
- Misses        796      799       +3     
- Partials      287      288       +1     

see 1 file with indirect coverage changes

Flag	Coverage Δ
certificate-operator	69.23% <ø> (ø)
component-tests	58.04% <ø> (-0.33%)	⬇️
lifecycle-operator	83.46% <ø> (ø)
metrics-operator	88.32% <ø> (ø)
scheduler	34.74% <ø> (ø)

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

[StackScribe]

Very nicely done! I left a few minor suggestions for your consideration

[odubajDT]

Very nicely done! I left a few minor suggestions for your consideration

Thank you for your review :)

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[StackScribe]

Should this PR have at least a bit of a description, to set a good example for other contributors if nothing else. It might also be nice if it linked to #3356 just so that issue has a comprehensive list of the work that's been done.