Add assets to .dockerignore

Signed-off-by: kfei <kfei@kfei.net>
Improve Dockerfile

Now the build cache will be invalid only if Gemfile has changed.

Signed-off-by: kfei <kfei@kfei.net>
Display restaurant's MIN and PHONE in home page

Signed-off-by: kfei <kfei@kfei.net>
Source code reformatted

Signed-off-by: kfei <kfei@kfei.net>