Include mention of gnome and how to set screenshot hotkey when installed via flatpak (flameshot-org#4490)

Author: zitr0y

README.md

@@ -63,7 +63,7 @@
   - [Local](#local)
   - [Global](#global)
     - [On KDE Plasma desktop](#on-kde-plasma-desktop)
-    - [On Ubuntu](#on-ubuntu-tested-on-2204)
+    - [On Gnome (Ubuntu, Fedora and more)](#on-gnome-ubuntu-fedora-and-more)
     - [On XFCE 4](#on-xfce-4)
     - [On Fluxbox](#on-fluxbox)
 - [Considerations](#considerations)
@@ -281,19 +281,19 @@ Steps for using the configuration:
     ln -s /var/lib/flatpak/exports/bin/org.flameshot.Flameshot ~/.local/bin/flameshot
     ```
 
-#### On Ubuntu (Tested 22.04)
+#### On Gnome (Ubuntu, Fedora and more)
 
-To use Flameshot instead of the default screenshot application in Ubuntu we need to remove the binding on <kbd>Prt Sc</kbd> key, and then create a new binding for `/usr/bin/flameshot gui` ([adapted](https://askubuntu.com/posts/1039949/revisions) from [Pavel's answer on AskUbuntu](https://askubuntu.com/revisions/1036473/1)).
+To use Flameshot instead of the default screenshot application in Gnome we need to remove the binding on <kbd>Prt Sc</kbd> key, and then create a new binding for `flameshot gui` ([adapted](https://askubuntu.com/posts/1039949/revisions) from [Pavel's answer on AskUbuntu](https://askubuntu.com/revisions/1036473/1)).
 
 1. Remove the binding on <kbd>Prt Sc</kbd>:
 
-   Ubuntu 22.04: Go to _Settings_ > _Keyboard_ > _View and Customise Shortcuts_ > _Screenshots_ > _Take a screenshot interactively_ and press `backspace`
+   Go to _Settings_ > _Keyboard_ > _View and Customise Shortcuts_ > _Screenshots_ > _Take a screenshot interactively_ and press `backspace`
 
 2. Add custom binding on <kbd>Prt Sc</kbd>:
 
-   Ubuntu 22.04: Go to _Settings_ > _Keyboard_ > _View and Customise Shortcuts_ > _Custom shortcuts_ and press the '+' button at the bottom.
+   Go to _Settings_ > _Keyboard_ > _View and Customise Shortcuts_ > _Custom shortcuts_ and press the '+' button at the bottom.
 
-3. Name the command as you like it, e.g. `flameshot`. And in the command insert `/usr/bin/flameshot gui`.
+3. Name the command as you like it, e.g. `flameshot`. And in the command insert `/usr/bin/flameshot gui` or `flatpak run org.flameshot.Flameshot gui` if installed via flatpak.
 
 4. Then click "_Set Shortcut.._" and press <kbd>Prt Sc</kbd>. This will show as "_print_".
 
@@ -594,4 +594,4 @@ Thanks to sponsors:
 - [Namecheap](https://www.namecheap.com/)
 - [JetBrains](https://www.jetbrains.com/)
 - [SignPath](https://signpath.io/)
-- [addy.io](https://addy.io/)
+- [addy.io](https://addy.io/)