use congo thumb and cover images (#39)

#### 📖 Summary

<!-- Provide a summary of your changes. Describe the why and not how. -->

#### 📑 Test Plan

> 💡 Select your test plan for the code changes.

- [x] CI pipeline
- [ ] Custom test
- [ ] No test plan

##### Details / Justification

<!-- Add your test details or justification for missing tests here. -->

#### 📚 Additional Notes

<!-- A place for additional detail notes. -->

Co-authored-by: OCram85 <marco.blessing@googlemail.com>
Reviewed-on: #39

content/posts/pwsh-read-only-class-properties/index.md

@@ -18,9 +18,6 @@ tags: ['class', 'read-only', 'properties']
 # showEdit: false
 # sharingLinks: [null]
 ---
-
-{{< figure src="vader_cube.png" width="800" height="800">}}
-
 {{< note >}}
 If you're not familiar with Powershell classes I suggest you reading this awesome blog article from Michael Willis
 [Powershell v5 Classes & Concepts](https://xainey.github.io/2016/powershell-classes-and-concepts/). It covers