Update docs, closes #1346

docs/getting-started.md

@@ -54,7 +54,7 @@ $ git clone https://github.com/doccano/doccano.git
 $ cd doccano
 $ pipenv sync --dev
 $ pipenv shell
-$ cd app
+$ cd backend
 $ python manage.py migrate
 $ python manage.py create_roles
 $ python manage.py create_admin --noinput --username "admin" --email "admin@example.com" --password "password"
@@ -64,7 +64,7 @@ $ python manage.py runserver
 ### Node.js
 
 ```bash
-$ cd doccano/frontend
+$ cd frontend
 $ yarn install
 $ yarn dev
 ```

docs/index.md

@@ -28,12 +28,12 @@ Final demo is one of the sequence to sequence tasks, machine translation. Since
 
 ## Quick Deployment
 
-### Azure
+<!-- ### Azure
 
 Doccano can be deployed to Azure ([Web App for Containers](https://azure.microsoft.com/en-us/services/app-service/containers/) +
 [PostgreSQL database](https://azure.microsoft.com/en-us/services/postgresql/)) by clicking on the button below:
 
-[![Deploy to Azure](https://azuredeploy.net/deploybutton.svg)](https://portal.azure.com/#create/Microsoft.Template/uri/https%3A%2F%2Fraw.githubusercontent.com%2Fdoccano%2Fdoccano%2Fmaster%2Fazuredeploy.json)
+[![Deploy to Azure](https://azuredeploy.net/deploybutton.svg)](https://portal.azure.com/#create/Microsoft.Template/uri/https%3A%2F%2Fraw.githubusercontent.com%2Fdoccano%2Fdoccano%2Fmaster%2Fazuredeploy.json) -->
 
 ### Heroku
 

docs/project_structure.md

@@ -4,7 +4,7 @@ The important files/directories are as follows:
 
 ```
 /
-├── app/
+├── backend/
 ├── frontend/
 ├── nginx/
 ├── tools/
@@ -14,9 +14,9 @@ The important files/directories are as follows:
 
 Consider them:
 
-**[app/](https://github.com/doccano/doccano/tree/master/app)**
+**[backend/](https://github.com/doccano/doccano/tree/master/backend)**
 
-The `app/` directory contains backend code. See [below](#Backend).
+The `backend/` directory contains backend code. See [below](#Backend).
 
 **[frontend/](https://github.com/doccano/doccano/tree/master/frontend)**
 
@@ -45,7 +45,7 @@ In the future, they will be integrated into the current code or removed:
 
 ```
 /
-├── app/
+├── backend/
 ├── └── server/
 ```
 
@@ -56,24 +56,24 @@ The important directories are as follows:
 
 ```
 /
-├── app/
+├── backend/
 ├── ├── api/
 ├── ├── app/
 └── └── authentification/
 ```
 
-**[app/api/](https://github.com/doccano/doccano/tree/master/app/api)**
+**[backend/api/](https://github.com/doccano/doccano/tree/master/backend/api)**
 
-The `app/api` directory contains backend API application. We use [Django Rest Framework](https://www.django-rest-framework.org) to implement the API.
+The `backend/api` directory contains backend API application. We use [Django Rest Framework](https://www.django-rest-framework.org) to implement the API.
 If you want to add new API, change the contents of this directory.
 
-**[app/app/](https://github.com/doccano/doccano/tree/master/app/app)**
+**[backend/app/](https://github.com/doccano/doccano/tree/master/backend/app)**
 
-The `app/app` directory contains Django project settings. See [Writing your first Django app, part 1](https://docs.djangoproject.com/en/3.0/intro/tutorial01/#creating-a-project).
+The `backend/app` directory contains Django project settings. See [Writing your first Django app, part 1](https://docs.djangoproject.com/en/3.0/intro/tutorial01/#creating-a-project).
 
-**[app/authentification/](https://github.com/doccano/doccano/tree/master/app/authentification)**
+**[backend/authentification/](https://github.com/doccano/doccano/tree/master/backend/authentification)**
 
-The `app/authentification` directory contains authentification application. It is mainly used for user signup.
+The `backend/authentification` directory contains authentification application. It is mainly used for user signup.
 
 ## Frontend