Merge branch 'master' into feature/add-try-qutip

Author: hodgestar

404.md

@@ -0,0 +1,25 @@
+---
+title: QuTiP 404 - Page Not Found
+---
+
+<div class="jumbotron jumbotron-fluid">
+    <div class="container center-block">
+      <h1 class="display-4" style="width: 80%; margin: auto;">Oops! Page not found.</h1>
+      <img src="/images/logo.png" alt="QuTiP logo" style="opacity: 50%; width: 50%; margin: 1em auto;"/>
+    </div>
+</div>
+
+Oops! The page you requested could not be found.
+
+If you are looking for the latest QuTiP documentation, you can find it is now
+located on Read The Docs:
+
+  * [QuTiP 5 documentation](https://qutip.readthedocs.io/en/qutip-5.0.x/)
+  * [QuTiP 4 documentation](https://qutip.readthedocs.io/en/qutip-4.7.x/)
+
+Otherwise please return to the [QuTiP homepage](https://qutip.org/) or select
+a link from the navigation bar above.
+
+If you still can't find what you're looking for, please email the
+[Google Group](https://groups.google.com/group/qutip) or open an issue on
+[GitHub](https://www.github.com/qutip/qutip.github.io/issues).