Merge branch 'master' of https://github.com/Xilinx/finn into dev

docs/_layouts/default.html

@@ -29,6 +29,7 @@
           <li class="download"><a class="buttons" style="background: none" href="https://xilinx.github.io/finn/about">About</a></li>
           <li class="download"><a class="buttons" style="background: none" href="https://xilinx.github.io/finn/blog">Blog</a></li>
           <li class="download"><a class="buttons" style="background: none" href="https://xilinx.github.io/finn/demos">Demos</a></li>
+          <li class="download"><a class="buttons" style="background: none" href="https://finn.readthedocs.io">Documentation</a></li>
           <li class="download"><a class="buttons" style="background: none" href="https://github.com/Xilinx/brevitas">Brevitas</a></li>
           <li class="download"><a class="buttons" style="background: none" href="https://github.com/Xilinx/finn-hlslib">HLS Library</a></li>
           <li class="download"><a class="buttons" style="background: none" href="https://xilinx.github.io/finn/publications">Publications</a></li>