re-organize README

README.md

@@ -77,6 +77,10 @@ the following section will show a step-by-step guide on how to get your own emai
 
 [3. Contributing Guide](#contributing)
 
+[4. API](#api)
+
+[5. OAuth2/OpenID Connect](#oauth)
+
 
 ## General Architecture
 
@@ -615,7 +619,49 @@ then open http://localhost:7777, you should be able to login with the following
 john@wick.com / password
 ```
 
-### API
+### Database migration
+
+The database migration is handled by `alembic`
+
+Whenever the model changes, a new migration has to be created.
+
+If you have Docker installed, you can create the migration by the following script: 
+
+```bash
+sh new_migration.sh 
+```
+
+Make sure to review the migration script before committing it. 
+Sometimes (very rarely though), the automatically generated script can be incorrect.
+
+We cannot use the local database to generate migration script as the local database doesn't use migration. 
+It is created via `db.create_all()` (cf `fake_data()` method). This is convenient for development and 
+unit tests as we don't have to wait for the migration.
+
+### Code structure
+
+The repo consists of the three following entry points:
+
+- wsgi.py and server.py: the webapp.
+- email_handler.py: the email handler.
+- cron.py: the cronjob.
+
+Here are the small sum-ups of the directory structures and their roles:
+
+- app/: main Flask app. It is structured into different packages representing different features like oauth,  api, dashboard, etc.
+- local_data/: contains files to facilitate the local development. They are replaced during the deployment.
+- migrations/: generated by flask-migrate. Edit these files will be only edited when you spot (very rare) errors on the database migration files.
+- static/: files available at `/static` url.
+- templates/: contains both html and email templates.
+- tests/: tests. We don't really distinguish unit, functional or integration test. A test is simply here to make sure a feature works correctly.
+
+The code is formatted using https://github.com/psf/black, to format the code, simply run
+
+```
+black .
+```
+
+## API
 
 SimpleLogin current API clients are Chrome/Firefox/Safari extension and mobile (iOS/Android) app.
 These clients rely on `API Code` for authentication.
@@ -1144,49 +1190,9 @@ Output:
 200 if user is upgraded successfully
 4** if any error.
 
-### Database migration
 
-The database migration is handled by `alembic`
 
-Whenever the model changes, a new migration has to be created.
+## OAuth
-
-If you have Docker installed, you can create the migration by the following script: 
-
-```bash
-sh new_migration.sh 
-```
-
-Make sure to review the migration script before committing it. 
-Sometimes (very rarely though), the automatically generated script can be incorrect.
-
-We cannot use the local database to generate migration script as the local database doesn't use migration. 
-It is created via `db.create_all()` (cf `fake_data()` method). This is convenient for development and 
-unit tests as we don't have to wait for the migration.
-
-### Code structure
-
-The repo consists of the three following entry points:
-
-- wsgi.py and server.py: the webapp.
-- email_handler.py: the email handler.
-- cron.py: the cronjob.
-
-Here are the small sum-ups of the directory structures and their roles:
-
-- app/: main Flask app. It is structured into different packages representing different features like oauth,  api, dashboard, etc.
-- local_data/: contains files to facilitate the local development. They are replaced during the deployment.
-- migrations/: generated by flask-migrate. Edit these files will be only edited when you spot (very rare) errors on the database migration files.
-- static/: files available at `/static` url.
-- templates/: contains both html and email templates.
-- tests/: tests. We don't really distinguish unit, functional or integration test. A test is simply here to make sure a feature works correctly.
-
-The code is formatted using https://github.com/psf/black, to format the code, simply run
-
-```
-black .
-```
-
-### OAuth flow
 
 SL currently supports code and implicit flow.