Restructuring the project repository for better separation of concern.

[bepitulaz]

I'm going to restructure the project repository and make the source code clearer. My plan is making the directory structure looks like this:

|- readme.md
|- backend
|---- main.go
|---- go.mod
|---- other_backend_src
|- frontend
|---- storybook
|---- package.json
|---- other_frontend_src
|- languages
|---- locale
|- scripts
|---- build_script.sh

I hope this structure can help other contributors navigate and explore this project clearer than before. Furthermore, to make extending Tania's feature easier.