Added Hindi tutorials for NextJS

[Akshat3144]

What does this PR do?

Add resource(s)

For resources

Description

This PR adds five new Hindi tutorials for NextJS to the courses/free-courses-hi.md file.

Why is this valuable (or not)?

These additions will help Hindi-speaking learners to find quality resources for learning NextJS.

How do we know it's really free?

All the added resources are freely available on YouTube.

For book lists, is it a book? For course lists, is it a course? etc.

These are video courses.

Checklist:

• [x] Read our contributing guidelines.
• [x] Search for duplicates.
• [x] Include author(s) and platform where appropriate.
• [x] Put lists in alphabetical order, correct spacing.
• [x] Add needed indications (PDF, access notes, under construction).
• [x] Used an informative name for this pull request.

Follow-up

• Check the status of GitHub Actions and resolve any reported warnings!

[github-actions[bot]]

Linter failed, fix the error(s):

  free-programming-books/courses/free-courses-hi.md
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