Add some extra fields in course schema, edited tests, created search query by name for course

[Devesh21700Kumar]

Description

Add some extra field in course schema along with documentation and tests correction in controllers and services

Updated swagger doc accordingly

Added separate endpoints for cards of Course in Home Page

Added search query for getting course info by name with regex and lean for fast quering of data (The search functionality)

Type of Change:

• [x] Code
• [x] New Feature
• [x] Documentation
• [x] Testing

How Has This Been Tested?

Terminal commands to test code:- 1). npm run lint 2). npm run lint:fix 3). nest start 4). npm run test

Checklist

• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] All new and existing tests passed.
• [x] My changes generate no new warnings
• [x] The title of my pull request is a short description of the requested changes.

[Abhishek-kumar09]

Have tried out testing your changes after making changes?

[Devesh21700Kumar]

Have tried out testing your changes after making changes?

yes 1). postman test for changes 2). swagger change for examples 3). npm run test for test changes