Add writhen guide for App installation and simplify the manu regarding upgrade migration guides

docs/manual/Quick-Start Guides/03-Installing-an-App.md

@@ -1,5 +1,26 @@
 # 03 - Installing Apps
 
+Here we will go over a basic install of Plex, to showcase how you can install a TrueNAS SCALE App from the TrueCharts Catalog with mostly default settings
+
+##### Requirements
+
+- Make sure your storage-pool is created and working
+- Make Make sure you selected your storage-pool when you first opened the "Apps" interface, if not please refer to quick-start guide `01 - First time Apps setup`
+- Make sure you have a working internet connection and can reach github and truecharts.org from the host system.
+- Make sure you already added the TrueCharts catalog from guide 02
+
+##### Adding the App
+
+- Go to `Available Applications`
+- Click the `Install` button next to the App you want to install
+- on step 01 give your App a name
+- Unless you need to change something, for example the allowed networks for plex, you can ignore steps and just click `Next`
+- On the last step, review any changes you made to the defaults in the summary
+- Click `Submit` to install your App of choice
+- Under `Installed applications` you will see a new tile with the name of your App
+- Wait a few minutes untill the App is started, a `Portal` button will appear that takes you to the GUI of your App of choice
+
+
 #### Video Guide
 
-![type:video](https://www.youtube.com/embed/rfgCkCek7_s)
+![type:video](https://www.youtube.com/embed/yJ5fC8UGlz8)

docs/manual/migration.md

@@ -1,4 +1,4 @@
-# Migration Guides
+# Migration between versions
 
 Sometimes we can not guarantee automatic updating between new versions of our Apps.
 These pages include some common scenario's and give some guidance how to manually move between different versions and Trains.