* Fix URLs to work when `baseURL` is in a sub-directory * Use `RelPermalink` to not have assets loaded from `baseUrl` * Add `.vercel` to gitignore * Remove deploy Github Action, we are now using Vercel
* add japanese menu to config.toml * add i18n/ja.toml * add content/ja/_index.md * add content/ja/user/*.md * Removed incorrect note in posting.md. Co-authored-by: k_taka <k_taka@gihyo.co.jp>