Configure iTerm2 to handle x-man-page URLs

iTermManPagerHandler

- Create a new profile, e.g. Man Page Viewer
- Set the command to `bash -c "echo $$HOST$$ | sed -E 's/(.*)\/(.*)/\1 \2/' | xargs man"`
- Select x-man-page from the "Schemes handled" drop down

The bash -c was necessary
Had to change from $$HOST$$$$PATH$$ to just $$HOST$$ because iTerm2 was not substituting and only sending $$HOST to the echo.