Fix crash after initial re-compile and other improvements

A crash would occur after the initial compilation of the configuration, which is a regression introduced in v2.2.4.

Additional improvements:

• Fix crash after initial run 6c7eee8
• Fallback to a global elm-json if npx elm-json fails 89518b0
• Include LOCAL_ELM_REVIEW in review application hash 0b859ae
• Hash files from node_modules too 565fc4a

v2.2.4...v2.2.5