doc: update all screenshot URLs

- https://help.imgur.com/hc/en-us/articles/14415587638029-Imgur-Terms-of-Service-Update-April-19-2023-
- screenshots uploaded to imgur but not associated with an account will be deleted

README.md

@@ -4,7 +4,7 @@
 
 [Debian GNU/Linux](https://www.debian.org/) desktop operating system for personal computers & workstations.
 
-![](https://i.imgur.com/xbRbpM3.png)
+![](https://gitlab.com/nodiscc/toolbox/-/raw/master/DOC/SCREENSHOTS/xbRbpM3.png)
 
 ## Features
 
@@ -43,9 +43,9 @@ This repository contains the `live-build` configuration and scripts used to buil
 
 ## Screenshots
 
-![](https://i.imgur.com/xbRbpM3.png)
+![](https://gitlab.com/nodiscc/toolbox/-/raw/master/DOC/SCREENSHOTS/xbRbpM3.png)
 
-![](https://i.imgur.com/iyA3bov.png)
+![](https://gitlab.com/nodiscc/toolbox/-/raw/master/DOC/SCREENSHOTS/iyA3bov.png)
 
 
 ## Source code

doc/md/download-and-installation.md

@@ -38,7 +38,7 @@ sha512sum -c SHA512SUMS
   * Right-click the ISO image file, and click `Open with ... > Disk image writer` (requires [gnome-disks](https://packages.debian.org/bullseye/gnome-disk-utility)) **Caution, all data on the USB drive will be erased**
   * Or, using the command line: Identify your USB drive device name (eg. `/dev/sdc`) using the `lsblk` command; Write the ISO image to the drive using `sudo dd /path/to/live-image.iso /dev/sdXXX`.
 
-![](https://i.imgur.com/1fYOBty.png)
+![](https://gitlab.com/nodiscc/toolbox/-/raw/master/DOC/SCREENSHOTS/1fYOBty.png)
 
 
 #### To USB - From Windows

doc/md/index.md

@@ -4,7 +4,7 @@
 
 [Debian GNU/Linux](https://www.debian.org/) desktop operating system for personal computers & workstations.
 
-![](https://i.imgur.com/xbRbpM3.png)
+![](https://gitlab.com/nodiscc/toolbox/-/raw/master/DOC/SCREENSHOTS/xbRbpM3.png)
 
 ## Features
 
@@ -43,9 +43,9 @@ This repository contains the `live-build` configuration and scripts used to buil
 
 ## Screenshots
 
-![](https://i.imgur.com/xbRbpM3.png)
+![](https://gitlab.com/nodiscc/toolbox/-/raw/master/DOC/SCREENSHOTS/xbRbpM3.png)
 
-![](https://i.imgur.com/iyA3bov.png)
+![](https://gitlab.com/nodiscc/toolbox/-/raw/master/DOC/SCREENSHOTS/iyA3bov.png)
 
 
 ## Source code