Revert "Revert "画像アップロード機能のコア部分を実装""

This reverts commit d11e48cdefef7e1a6f5b4410252f1457932801cd.
今度こそ画像アップロードの基本形出来た
Remove redundant features.
Change application root address.
Remove home class.
Merge branch 'feature/image_upload'