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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

:exclamation: 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

```diff @@ 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](https://app.codecov.io/gh/keptn/lifecycle-toolkit/pull/3521/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keptn) | [Flag](https://app.codecov.io/gh/keptn/lifecycle-toolkit/pull/3521/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keptn) | Coverage Δ | | |---|---|---| | [certificate-operator](https://app.codecov.io/gh/keptn/lifecycle-toolkit/pull/3521/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keptn) | `69.23% <ø> (ø)` | | | [component-tests](https://app.codecov.io/gh/keptn/lifecycle-toolkit/pull/3521/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keptn) | `58.04% <ø> (-0.33%)` | :arrow_down: | | [lifecycle-operator](https://app.codecov.io/gh/keptn/lifecycle-toolkit/pull/3521/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keptn) | `83.46% <ø> (ø)` | | | [metrics-operator](https://app.codecov.io/gh/keptn/lifecycle-toolkit/pull/3521/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keptn) | `88.32% <ø> (ø)` | | | [scheduler](https://app.codecov.io/gh/keptn/lifecycle-toolkit/pull/3521/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keptn) | `34.74% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keptn#carryforward-flags-in-the-pull-request-comment) to find out more.

[odubajDT]

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

Thank you for your review :)

[sonarcloud[bot]]

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 https://github.com/keptn/lifecycle-toolkit/issues/3356 just so that issue has a comprehensive list of the work that's been done.