remove duplicated and confusable requirements

- Consolidated to <root>/requirements/*.txt
- Update README

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
use VPC/RDS for sotmjp-website in default

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
backup script: encrypt

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
fix host names

Signed-off-by: Hiroshi Miura <miurahr@linux.com>
JAPANESE: update homepage headline

Signed-off-by: Hiroshi Miura <miurahr@linux.com>