Fix link to FAQ in README.md

The link points to the page in the old structure of the docs, we forgot to update the readme of the repo when making that change.

Author: vloncar

README.md

@@ -65,7 +65,7 @@ hls4ml.report.read_vivado_report('my-hls-test')
 
 # FAQ
 
-List of frequently asked questions and common HLS synthesis can be found [here](https://fastmachinelearning.org/hls4ml/faq.html)
+List of frequently asked questions and common HLS synthesis can be found [here](https://fastmachinelearning.org/hls4ml/intro/faq.html)
 
 # Citation
 If you use this software in a publication, please cite the software