Update git repo name to fred, without -staging
README: remove outdated Perl module mention

This has not been necessary since the scripts commit:

5103ff1 Remove separate JNLP substitution
README: remove Google Drive reference

Google Drive is no longer used.
README: update repo names to reflect renames
faq: update Windows installer repo links

The links were pointing to the AHK installer which is no longer used.
README: update release command fragment

If run outside its containing directory the script cannot source the
common functions.