Update tabcontents.yaml

fix URL redirect http -> https

Author: partev

content/en/tabcontents.yaml

@@ -89,7 +89,7 @@ params:
       alttext: A computer chip.
       img: /images/content_images/sc_dom_img/quantum_computing.svg
       links:
-        - url: http://qutip.org
+        - url: https://qutip.org
           label: QuTiP
         - url: https://pyquil-docs.rigetti.com/en/stable
           label: PyQuil