Added flathub shield to README (#8329)

Author: qstokkink

README.rst

@@ -1,14 +1,29 @@
 |doi| |openhub|
 |python_3_10| |contributors| |pr_closed| |issues_closed|
 
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+.. raw:: html
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+   <p align="center">👉 <a href="https://github.com/Tribler/tribler/releases/latest">Download the Latest Release </a> 👈</p>
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+*Alternative downloads:*
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+- `flathub <https://flathub.org/apps/org.tribler.Tribler>`_ |flathub|
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+
 *******
 Tribler
 *******
 
  Towards making Bittorrent anonymous and impossible to shut down.
 
-👉 `Download the Latest Release <https://github.com/Tribler/tribler/releases/latest>`__ 👈
-
 Tribler aims to give anonymous access to content. We are trying to make privacy, strong cryptography, and authentication the Internet norm.
 
 We implemented `our own enhanced Tor-like network for anonymous torrent downloading <https://github.com/Tribler/tribler/wiki/Anonymous-Downloading-and-Streaming-specifications>`_, with hidden services based
@@ -139,3 +154,6 @@ This file is part of Tribler, Copyright 2004-2024. Tribler is licensed under the
 
 .. |python_3_10| image:: https://img.shields.io/badge/python-3.10-blue.svg
     :target: https://www.python.org/
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+.. |flathub| image:: https://img.shields.io/flathub/downloads/org.tribler.Tribler
+   :alt: Flathub Downloads