Remove boing-ball.mp4 from 2011/eastman

This video unfortunately comes from YouTube and so even if the link
eventually dies we should not have it here. A link was provided.

Updated the .entry.json and manifest in the index.html plus checked
other formatting issues.

2011/eastman/README.md

@@ -11,7 +11,7 @@
     ./eastman
 ```
 
-NOTE: to restore your cursor in your shell, try `reset`.
+**NOTE**: to restore your cursor in your shell, try `reset`.
 
 
 ## Try:
@@ -23,7 +23,7 @@ again. Try doing this a number of times with different sizes each time.
     ./eastman
 ```
 
-NOTE: to restore your cursor in your shell, try `reset`.
+**NOTE**: to restore your cursor in your shell, try `reset`.
 
 
 ## Judges' remarks: