Feature/add screenshot (#251)

* Add screenshot

* Update changelog

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Added the name to the position detail dialog when opened from the transactions table
+- Added a screenshot to the blog posts
 
 ## 1.31.1 - 01.08.2021
 

README.md

@@ -26,6 +26,10 @@
 
 **Ghostfolio** is an open source wealth management software built with web technology. The application empowers busy people to keep track of their wealth like stocks, ETFs or cryptocurrencies and make solid, data-driven investment decisions.
 
+<div align="center">
+  <img src="./apps/client/src/assets/images/screenshot.png" width="300">
+</div>
+
 ## Ghostfolio Premium
 
 Our official **[Ghostfolio Premium](https://ghostfol.io/pricing)** cloud offering is the easiest way to get started. Due to the time it saves, this will be the best option for most people. The revenue is used for covering the hosting costs.

apps/client/src/app/pages/blog/2021/07/hallo-ghostfolio/hallo-ghostfolio-page.html

@@ -65,6 +65,14 @@
             Finanzierung einer Wohnung, Ghostfolio bietet eine solide,
             datengestützte Entscheidungshilfe.
           </p>
+          <p class="my-5 text-center">
+            <img
+              alt="Ghostfol.io Screenshot"
+              src="./assets/images/screenshot.png"
+              style="max-width: 100%; width: 20rem"
+              title="Ghostfol.io Screenshot"
+            />
+          </p>
           <p>
             Ich lege grossen Wert auf Datenschutz. Als
             <a href="https://github.com/ghostfolio/ghostfolio"

apps/client/src/app/pages/blog/2021/07/hello-ghostfolio/hello-ghostfolio-page.html

@@ -63,6 +63,14 @@
             asset classes (stocks, cryptocurrencies, ETFs, etc.) or financing an
             apartment, Ghostfolio offers solid, data-driven decision support.
           </p>
+          <p class="my-5 text-center">
+            <img
+              alt="Ghostfol.io Screenshot"
+              src="./assets/images/screenshot.png"
+              style="max-width: 100%; width: 20rem"
+              title="Ghostfol.io Screenshot"
+            />
+          </p>
           <p>
             As I value privacy, data protection is an integral part of
             Ghostfolio. As