Remove support for 'PW_FORMAT' environment variable
Remove support for 'PW_FORMAT' environment variable

This highlights an issue with 'sphinx-click' [1]. Said issue is resolved
with sphinx-click 1.4.1 but that's not available on Fedora, so we simply
ignore this for now.

[1] https://github.com/click-contrib/sphinx-click/issues/26

Signed-off-by: Stephen Finucane <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@that.guru>

getpatchwork/git-pw,stephenfin/git-pw