docs: Fix root folder gitbook

.gitbook.yaml

+root: ./docs/
+
+​structure:  
+    readme: ../README.md  
+    summary: ../SUMMARY.md​

SUMMARY.md → docs/SUMMARY.md

 # Table of contents
 
-* [🏠 Home](README.md)
+* [🏠 Home](../README.md)
 
 ## For Developers
 
-* [Get Started](docs/for-developers/get-started/README.md)
-  * [Introduction](docs/get-started/Introduction.md)
-  * [Setup development environment](docs/get-started/Setup-development-environment.md)
+* [Get Started](for-developers/get-started/README.md)
+  * [Introduction](for-developers/get-started/Introduction.md)
+  * [Setup development environment](for-developers/get-started/Setup-development-environment.md)
 * [Configuration](for-developers/configuration/README.md)
   * [Gateway](for-developers/configuration/gateway.md)
-* [Connectors](docs/for-developers/connector/README.md)
-  * [Parsing response with JSONdata](docs/gateway/Connector/Parsing-response-with-JSONata.md)
+* [Connectors](for-developers/connector/README.md)
+  * [Parsing response with JSONdata](for-developers/connector/Parsing-response-with-JSONata.md)
 * [Gateway](for-developers/gateway/README.md)
   * [🔑 Authentication](for-developers/gateway/authentication.md)
   * [👥 Users](for-developers/gateway/users.md)
-* [Frontend](docs/for-developers/frontend/README.md)
-  * [Update GraphQL Queries](docs/frontend/Update-queries-GrahpQL-in-the-frontend.md)
+* [Frontend](for-developers/frontend/README.md)
+  * [Update GraphQL Queries](for-developers/frontend/Update-queries-GrahpQL-in-the-frontend.md)
   * [📊 Visualisations](for-developers/frontend/visualisations.md)

for-developers/authentication.md

-# Authentication
-
-The authentication implementation is based on [passport.js](https://www.passportjs.org) it allows a flexible way to implement different strategies inside the gateway. 
-
-For now the authentication system is quite simple and only use JWT. The real implementation of  authorization and authentication is left to the connector. 
-
-#### How it works ?
-
-The communication between the frontend and the gateway is handled by JWT token who contains user information such as his username.
-
-![](<../.gitbook/assets/image (2).png>)
-
-The gateway will handle the authentication process with the frontend in a unique fashion always using a JWT token. This token can contains information specific to some connector. For that purpose the user model contains a field `extraFields` which basically a dictionary.&#x20;
-
-{% code title="user.model.ts" %}
-```typescript
-import { Field, ObjectType } from '@nestjs/graphql';
-import { Entity, PrimaryColumn, Column } from 'typeorm';
-
-@Entity({ name: 'user' })
-@ObjectType()
-export class User {
-  @PrimaryColumn()
-  @Field()
-  id: string;
-
-  @Field()
-  username: string;
-
-  @Field({ nullable: true })
-  fullname?: string;
-
-  @Field({ nullable: true })
-  email?: string;
-
-  @Column({ nullable: true, default: false })
-  @Field({ nullable: true })
-  agreeNDA?: boolean;
-
-  extraFields?: Record<string, any>;
-}
-```
-{% endcode %}
-
-This field can be used by the connector to store information related to the user as other token for engine API endpoints.
-
-#### Login&#x20;
-
-The real login system is delegated to the connector by using the `login` method in the interface.
-
-{% code title="engine.interface.ts" %}
-```typescript
-export interface IEngineService {
-  // ...
-  
-  /**
-   * Method that login a user with username and password
-   * @param username
-   * @param password
-   * @returns User object or empty if user not found
-   */
-  login?(
-    username: string,
-    password: string,
-  ): Promise<User | undefined>;
-
-  // ...
-}
-```
-{% endcode %}
-
-This method can be optional as the authentication can be made by a 3rd party system under the same domain as this is the case for `exareme`.
-
-When the login is performed, this function should return a `User` object and can feed the `extraFields` attribute with data needed to perform future request to the engine.
-
-#### Logout
-
-The same mechanism is applied to the logout system using the method logout from the engine.
-
-{% code title="engine.interface.ts" %}
-```typescript
-export interface IEngineService {
-  // ...
-  
-  logout?(req: Request
-  ): Promise<void>;
-
-  // ...
-}
-```
-{% endcode %}
-