Improve Japanese in LXD introduction

Signed-off-by: Hiroaki Nakamura <hnakamur@gmail.com>
Remove the sponsors section from the frontpage

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Merge pull request #20 from hnakamur/lxd_introduction_ja_improvements

Improve Japanese in LXD introduction
Add Japanese "Getting started - command line" page for LXD

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Merge pull request #21 from tenforward/japanese

Add Japanese "Getting started - command line" page for LXD