move all TODO to the frontmatter

Author: hug-sch

docs/en/getting-started/installation.md

@@ -1,5 +1,7 @@
 ---
 title: Installation
+TODO: difference between windows installer & zip + adding how to install on macOS & Linux
+TODO: explain third box in figure 3, the meaning of asc extension, and question windows 32 bits or 64 bits?
 ---
 
 PP is available for MacOS, Windows and Linux. You need to download it and do some installation steps. The easiest way to download and install the latest version of PP is by using one of the installer files at the [homepage](https://www.portfolio-performance.info/) (see fig 1). A link to the release notes of this latest version is also provided. 
@@ -15,10 +17,6 @@ You can also download the Windows - Installer (setup.exe). On Windows 11, you ge
 
    + Windows: you can download the compressed Zip-file and extract it in a directory at your choice. Even an USB-stick (about 250 MB free space) is fine (run from stick). You can also download the installer file (setup.exe). On Windows 11, you get a security warning about the dangers to run a exe-file. Double clicking on this file, will start the installation. You need about 200 MB of free space.
 
-TODO: difference between windows installer & zip + adding how to install on macOS & Linux
-TODO: difference between windows installer & zip + adding how to install on macOS & Linux
-{: .hidden} 
-
 # MacOS
 
 
@@ -27,30 +25,9 @@ The installer files are in fact stored in the [author's github repository](https
 
 ![Fig 3: Github repository for downloading (previous) releases](images/installation-download-github.svg)
 
-TODO: explain third box in figure 3, the meaning of asc extension, and question windows 32 bits or 64 bits?
-{: .hidden}
-
 You can edit and compile the source code; see [Contributing to Portfolio Performance](https://github.com/portfolio-performance/portfolio/blob/master/CONTRIBUTING.md#project-setup).
 
 # Updating the software
 After the first installation, the program will check on each start-up for new updates and install these automatically (see figure 1).
 
 ![Fig 1: Automatic updating with newer version](images/installation-update.png)
-
-# Github   
-The installer files are in fact stored in the [author's github repository](https://github.com/portfolio-performance/portfolio/releases). So, you can also download the program from this repository. If you ever should need a previous version, this is also the place to be (click on the version number at the left side).
-
-![Fig 3: Github repository for downloading (previous) releases](images/installation-download-github.svg)
-
-TODO: explain third box in figure 3, the meaning of asc extension, and question windows 32 bits or 64 bits?
-{: .hidden}
-
-You can edit and compile the source code; see [Contributing to Portfolio Performance](https://github.com/portfolio-performance/portfolio/blob/master/CONTRIBUTING.md#project-setup).
-
-# Updating the software
-After the first installation, the program will check on each start-up for new updates and install these automatically (see figure 1).
-
-![Fig 1: Automatic updating with newer version](images/installation-update.png)
-
-To disable this automatic updating, uncheck the option `Check for updates on start` at menu `Help > Preferences ... > Updates`. Use `Help > Check for updates ...` to check manually for updates.
-