FIX - Renaming s3 files to github fixes activation error

@leonstafford Looks like in the 'quick rewrite s3-> github' update it also needed to rename some of the s3 files to github. This fixed the activation error that I and others were experiencing. The updated file is attached below.

#4
#3

[wp2static-addon-github-master updated.zip](https://github.com/leonstafford/wp2static-addon-github/files/9247582/wp2static-addon-github-master.updated.zip)