Merge pull request jupyter#623 from jupyter/krassowski-fix-about-links

Fix Netflix Tech blog and Alfred P. Sloan Foundation links

Author: palewire

about.html

@@ -293,7 +293,7 @@
   - url: https://schmidtfutures.com/
     src: schmidt.svg
     alt: schmidt futures logo
-  - url: https://www.sloan.org/
+  - url: https://sloan.org/
     src: alfred.svg
     alt: sloan logo
 
@@ -323,7 +323,7 @@
   - url: https://www.mongodb.com/
     src: mongodb.svg
     alt: MongoDB logo
-  - url: https://techblog.netflix.com
+  - url: https://netflixtechblog.com/
     src: netflix-color.svg
     alt: netflix logo
   - url: https://www.quansight.com/