Change 'To run' to 'To use' in all README.md files

As in:

    sgit -e 's/# To run/# To use/g' '*README.md'

This makes consistent the message for how to use the program. 'How to
use' was chosen because one can run a program just by doing './foo' but
that doesn't imply that's how to use it but the purpose of the section
is how to use it.

1984/anonymous/README.md

@@ -8,7 +8,7 @@ Anonymous
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./anonymous
@@ -27,7 +27,7 @@ as the alternate code. See below in the tattoo side-by-side with the code.
 make alt
 ```
 
-#### To run:
+#### To use:
 
 NOTE: this version might not work on some systems like macOS.