New documentation URL (#1621)

* New documentation URL
* Update others docs urls (#1626)
---------
Co-authored-by: Kasper Overgård Nielsen <[email protected]>

README.md

@@ -16,7 +16,7 @@ This repository holds the source code for the Realm SDK for Flutter™ and Dart
 * **Simple:** Realm’s object-oriented data model is simple to learn, doesn’t need an ORM, and the [API](https://pub.dev/documentation/realm/latest/) lets you write less code to get apps up & running in minutes.
 * **Modern:** Realm supports latest Dart and Flutter versions and is built with sound null-safety.
 * **Fast:** Realm is faster than even raw SQLite on common operations while maintaining an extremely rich feature set.
-* **[MongoDB Atlas Device Sync](https://www.mongodb.com/atlas/app-services/device-sync)**: Makes it simple to keep data in sync across users, devices, and your backend in real-time. Get started for free with [a template application](https://github.com/mongodb/template-app-dart-flutter-todo) and [create the cloud backend](https://mongodb.com/realm/register?utm_medium=github_atlas_CTA&utm_source=realm_dart_github).
+* **[MongoDB Atlas Device Sync](https://www.mongodb.com/docs/atlas/app-services/sync/)**: Makes it simple to keep data in sync across users, devices, and your backend in real-time. Get started for free with [a template application](https://github.com/mongodb/template-app-dart-flutter-todo) and [create the cloud backend](https://mongodb.com/realm/register?utm_medium=github_atlas_CTA&utm_source=realm_dart_github).
 
 ## Getting Started
 
@@ -90,7 +90,7 @@ For API documentation go to
 
 Use [realm](https://pub.dev/packages/realm) package for Flutter and [realm_dart](https://pub.dev/packages/realm_dart) package for Dart applications.
 
-For complete documentation of the SDKs, go to the [Realm SDK documentation](https://docs.mongodb.com/realm/sdk/flutter/).
+For complete documentation of the SDKs, go to the [Realm SDK documentation](https://www.mongodb.com/docs/atlas/device-sdks/sdk/flutter/).
 
 If you are using the Realm SDK for the first time, refer to the [Quick Start documentation](https://www.mongodb.com/docs/realm/sdk/flutter/quick-start/).
 
@@ -352,7 +352,7 @@ This section is about how to use the Realm with [Device Sync](https://www.mongod
 1. Add a sync subscription and write data.
 
    Only data matching the query in the subscription will be synced to the server and only data matching the subscription will be downloaded to the local device realm file.
-   
+
    ``` dart
    realm.subscriptions.update((mutableSubscriptions) {
    mutableSubscriptions.add(realm.query<Task>(r'status == $0 AND progressMinutes == $1', ["completed", 100]));

packages/realm_dart/lib/src/credentials.dart

@@ -9,7 +9,7 @@ import 'app.dart';
 import 'user.dart';
 
 /// An enum containing all authentication providers. These have to be enabled manually for the application before they can be used.
-/// [Authentication Providers Docs](https://docs.mongodb.com/realm/authentication/providers/)
+/// [Authentication Providers Docs](https://www.mongodb.com/docs/atlas/app-services/authentication/#authentication-providers)
 /// {@category Application}
 enum AuthProviderType {
   /// For authenticating without credentials.
@@ -61,7 +61,7 @@ class Credentials implements Finalizable {
 
   /// Returns a [Credentials] object that can be used to authenticate an anonymous user.
   /// Setting [reuseCredentials] to `false` will create a new anonymous user, upon [App.logIn].
-  /// [Anonymous Authentication Docs](https://docs.mongodb.com/realm/authentication/anonymous)
+  /// [Anonymous Authentication Docs](https://www.mongodb.com/docs/atlas/app-services/authentication/anonymous/#anonymous-authentication)
   Credentials.anonymous({bool reuseCredentials = true}) : _handle = realmCore.createAppCredentialsAnonymous(reuseCredentials);
 
   /// Returns a [Credentials] object that can be used to authenticate a user with a Google account using an id token.
@@ -70,11 +70,11 @@ class Credentials implements Finalizable {
   /// Returns a [Credentials] object that can be used to authenticate a user with their email and password.
   /// A user can login with email and password only after they have registered their account and verified their
   /// email.
-  /// [Email/Password Authentication Docs](https://docs.mongodb.com/realm/authentication/email-password)
+  /// [Email/Password Authentication Docs](https://www.mongodb.com/docs/atlas/app-services/authentication/email-password/#email-password-authentication)
   Credentials.emailPassword(String email, String password) : _handle = realmCore.createAppCredentialsEmailPassword(email, password);
 
   /// Returns a [Credentials] object that can be used to authenticate a user with a custom JWT.
-  /// [Custom-JWT Authentication Docs](https://docs.mongodb.com/realm/authentication/custom-jwt)
+  /// [Custom-JWT Authentication Docs](https://www.mongodb.com/docs/atlas/app-services/authentication/custom-jwt/#custom-jwt-authentication)
   Credentials.jwt(String token) : _handle = realmCore.createAppCredentialsJwt(token);
 
   /// Returns a [Credentials] object that can be used to authenticate a user with a Facebook account.

packages/realm_dart/lib/src/user.dart

@@ -41,7 +41,7 @@ class User {
 
   /// Gets an [ApiKeyClient] instance that exposes functionality for managing
   /// user API keys.
-  /// [API Keys Authentication Docs](https://docs.mongodb.com/realm/authentication/api-key/)
+  /// [API Keys Authentication Docs](https://www.mongodb.com/docs/atlas/app-services/authentication/api-key/#api-key-authentication)
   ApiKeyClient get apiKeys {
     _ensureLoggedIn('access API keys');
 
@@ -50,7 +50,7 @@ class User {
 
   /// Gets a [FunctionsClient] instance that exposes functionality for calling remote Atlas Functions.
   /// A [FunctionsClient] instance scoped to this [User].
-  /// [Atlas Functions Docs](https://docs.mongodb.com/realm/functions/)
+  /// [Atlas Functions Docs](hhttps://www.mongodb.com/docs/atlas/app-services/functions/#atlas-functions)
   FunctionsClient get functions {
     _ensureLoggedIn('access API keys');