Adding Appian logo + fix link

Fix broken link on main page and add Appian to sponsors

Author: GuillaumeRoss

content/posts/hello.md

@@ -16,7 +16,7 @@ Not sure if Art into Science is for you? Take a peek at our [Youtube channel](ht
 
 Ready to join us? A limited number of tickets are still available. Secure your spot today!
 
-We can’t wait to see you at the Art into Science conference. Visit our [Schedule and Venue](https://artintoscience.com/schedule/) page for more information about travel and the daily schedule for the conference.
+We can’t wait to see you at the Art into Science conference. Visit our [Schedule and Venue](https://acod.io/schedule/) page for more information about travel and the daily schedule for the conference.
 
 [Get your tickets here!](https://www.zeffy.com/en-US/ticketing/e6b8943c-d7e1-417d-8335-b3f44d6b1f8a)
 

content/sponsors.md

@@ -4,6 +4,11 @@ title: "Sponsors"
 
 Art Into Science would not be possible without the generous contributions from our sponsors.
 
+# Venue sponsor
+
+## [Appian](https://appian.com)
+[![Appian Logo](/img/AppianLogo.png)](https://appian.com)
+
 # Gold Sponsors
 
 ## [CapitalOne](https://capitalone.com)