replaced hapi/joi package and repo references with joi

Author: Keimeno

content/pipes.md

@@ -229,13 +229,13 @@ This is, of course, exactly the use case for which pipes are designed. So let's
 
 There are several approaches available for doing object validation in a clean, [DRY](https://en.wikipedia.org/wiki/Don%27t_repeat_yourself) way. One common approach is to use **schema-based** validation. Let's go ahead and try that approach.
 
-The [Joi](https://github.com/hapijs/joi) library allows you to create schemas in a straightforward way, with a readable API. Let's build a validation pipe that makes use of Joi-based schemas.
+The [Joi](https://github.com/sideway/joi) library allows you to create schemas in a straightforward way, with a readable API. Let's build a validation pipe that makes use of Joi-based schemas.
 
 Start by installing the required package:
 
 ```bash
-$ npm install --save @hapi/joi
-$ npm install --save-dev @types/hapi__joi
+$ npm install --save joi
+$ npm install --save-dev @types/joi
 ```
 
 In the code sample below, we create a simple class that takes a schema as a `constructor` argument. We then apply the `schema.validate()` method, which validates our incoming argument against the provided schema.
@@ -247,7 +247,7 @@ In the next section, you'll see how we supply the appropriate schema for a given
 ```typescript
 @@filename()
 import { PipeTransform, Injectable, ArgumentMetadata, BadRequestException } from '@nestjs/common';
-import { ObjectSchema } from '@hapi/joi';
+import { ObjectSchema } from 'joi';
 
 @Injectable()
 export class JoiValidationPipe implements PipeTransform {

content/techniques/configuration.md

@@ -238,22 +238,22 @@ export class DatabaseModule {}
 
 #### Schema validation
 
-It is standard practice to throw an exception during application startup if required environment variables haven't been provided or if they don't meet certain validation rules. The `@nestjs/config` package enables use of the [Joi](https://github.com/hapijs/joi) npm package to support this type of validation. With Joi, you define an object schema and validate JavaScript objects against it.
+It is standard practice to throw an exception during application startup if required environment variables haven't been provided or if they don't meet certain validation rules. The `@nestjs/config` package enables use of the [Joi](https://github.com/sideway/joi) npm package to support this type of validation. With Joi, you define an object schema and validate JavaScript objects against it.
 
 Install Joi (and its types, for **TypeScript** users):
 
 ```bash
-$ npm install --save @hapi/joi
-$ npm install --save-dev @types/hapi__joi
+$ npm install --save joi
+$ npm install --save-dev @types/joi
 ```
 
-> warning **Notice** The latest version of `@hapi/joi` requires you to be running Node v12 or later. For older versions of node, please install `v16.1.8`. This is mainly after the release of `v17.0.2` which causes errors during build time. For more information, please refer to [their documentation](https://hapi.dev/family/joi/?v=17.0.2#install) & this [github issue](https://github.com/hapijs/joi/issues/2266#issuecomment-571667769).
+> warning **Notice** The latest version of `joi` requires you to be running Node v12 or later. For older versions of node, please install `v16.1.8`. This is mainly after the release of `v17.0.2` which causes errors during build time. For more information, please refer to [their documentation](https://hapi.dev/family/joi/?v=17.0.2#install) & this [github issue](https://github.com/hapijs/joi/issues/2266#issuecomment-571667769).
 
 Now we can define a Joi validation schema and pass it via the `validationSchema` property of the `forRoot()` method's options object, as shown below:
 
 ```typescript
 @@filename(app.module)
-import * as Joi from '@hapi/joi';
+import * as Joi from 'joi';
 
 @Module({
   imports: [
@@ -276,7 +276,7 @@ By default, unknown environment variables (environment variables whose keys are
 
 ```typescript
 @@filename(app.module)
-import * as Joi from '@hapi/joi';
+import * as Joi from 'joi';
 
 @Module({
   imports: [