doc/mainpage: fix RIOT paper URL

RIOT-OS · May 5, 2021 · ec3e540 · ec3e540
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diff --git a/doc/doxygen/src/mainpage.md b/doc/doxygen/src/mainpage.md
@@ -25,7 +25,7 @@ with  multithreading, IPC, system timers, mutexes etc.
 
 A good high-level overview can be found in the article
 [RIOT: An Open Source Operating System for Low-End Embedded Devices in
-the IoT](https://riot-os.org/docs/riot-ieeeiotjournal-2018.pdf)
+the IoT](https://www.riot-os.org/assets/pdfs/riot-ieeeiotjournal-2018.pdf)
 (IEEE Internet of Things Journal, December 2018).
 
 Contribute to RIOT                                        {#contribute-to-riot}