Rename exercises dir

Name it instead "topics" so it won't be
strange if some topics included "exercises" directory.

topics/aws/exercises/elastic_beanstalk_simple/exercise.md

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+## AWS Elastic Beanstalk - Node.js
+
+### Requirements
+ 
+1. Having a running node.js application on AWS Elastic Beanstalk platform
+ 
+### Objectives
+
+1. Create an AWS Elastic Beanstalk application with the basic properties
+a. No ALB, No Database, Just use the default platform settings
+
+### Out of scope
+
+1. Having ALB attached in place
+2. Having custom domain name in place
+3. Having automated pipelines in place
+4. Having blue-green deployment in place
+5. Writing the Node.js application

topics/aws/exercises/elastic_beanstalk_simple/solution.md

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+## AWS Elastic Beanstalk - Node.js
+
+### Prerequisites
+1. make sure the node.js application has a _npm start_ command specified in the __package.json__ file like the following example
+```
+{
+
+  "name": "application-name",
+  "version": "0.0.1",
+  "private": true,
+  "scripts": {
+    "start": "node app"
+  },
+  "dependencies": {
+    "express": "3.1.0",
+    "jade": "*",
+    "mysql": "*",
+    "async": "*",
+    "node-uuid": "*"
+} 
+```
+2. zip the application, and make sure to not zip the parent folder, only the files together, like:
+
+```
+\Parent - (exclude the folder itself from the the zip)
+- file1 - (include in zip)
+- subfolder1 (include in zip)
+- file2 (include in zip)
+- file3 (include in zip)
+```
+
+### Solution
+
+1. Create a "New Environment"
+2. Select Environment => _Web Server Environment_
+3. Fill the Create a web server environment section
+a. Fill the "Application Name"
+4. Fill the Environment information section
+a. Fill the "Environment Name"
+b. Domain - "Leave for autogenerated value"
+5. Platform
+a. Choose Platform => _node.js_
+6. Application Code => upload the Zipped Code from your local computer
+7. Create Environment
+8. Wait for the environment to come up
+9. Check the website
+a. Navigate to the _Applications_ tab, 
+b. select the recently created node.js app
+c. click on the URL - highlighted
+
+### Documentation
+[Elastic Beanstalk / Node.js getting started](https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/nodejs-getstarted.html)