docs: remove unavailable Rust book from Turkish section

[Vijayshree25]

Summary

This PR removes the link to the Turkish Rust book "Rust'a Giriş - Mahmut Bulut (PDF)" because it is no longer available. The corresponding section in free-programming-books-tr.md has been updated to reflect this.

Changes

• Modified books/free-programming-books-tr.md
• Removed the unavailable Rust book link
• Added a comment noting that the book is no longer available

Context

The Turkish Rust book previously listed is no longer accessible. This update ensures that the repository only contains valid resources for readers.

What does this PR do?

Add resource(s) | Remove resource(s) | Add info | Improve repo

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For resources

Description

Why is this valuable (or not)?

How do we know it's really free?

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

Checklist:

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

Follow-up

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

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-tr.md
  3:1-26:16  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2      remark-lint
 31:1-31:28  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2      remark-lint
179:1-179:9  warning  Do not use headings with similar content (27:1)                        no-duplicate-headings  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-tr.md
31:1-31:28  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-tr.md
  3:1-27:28  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2      remark-lint
 33:1-33:28  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2      remark-lint
 35:1-35:31  warning  Incorrect number of blank lines between heading and section            blank-lines-1-0-2      remark-lint
182:1-182:9  warning  Do not use headings with similar content (29:1)                        no-duplicate-headings  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-tr.md
  3:1-27:28  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2      remark-lint
 33:1-33:31  warning  Incorrect number of blank lines between heading and section            blank-lines-1-0-2      remark-lint
181:1-181:9  warning  Do not use headings with similar content (29:1)                        no-duplicate-headings  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-tr.md
   3:1-27:28  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2      remark-lint
  33:1-33:31  warning  Incorrect number of blank lines between heading and section            blank-lines-1-0-2      remark-lint
 181:1-181:9  warning  Do not use headings with similar content (29:1)                        no-duplicate-headings  remark-lint
183:1-183:84  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2      remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-tr.md
   3:1-27:28  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2      remark-lint
 179:1-179:9  warning  Do not use headings with similar content (29:1)                        no-duplicate-headings  remark-lint
181:1-181:84  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2      remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-tr.md
   3:1-27:28  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint
172:1-176:79  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-tr.md
3:1-27:28  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint

[github-actions]

Linter failed, fix the error(s):

free-programming-books/books/free-programming-books-tr.md
3:1-27:28  warning  Incorrect number of blank lines between last section and next heading  blank-lines-1-0-2  remark-lint

[github-actions]

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Please 🙏, take a moment and address the merge conflicts of your pull request before we can evaluate it again.

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