Remove references to plain `nikola init` [ci skip]

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
Allow specifying destination directory in the questionnaire part

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
minor fixes; list options

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>