docs: update CONTRIBUTING.md to reference Discord instead of Gitter

Fixes #7105

Author: gowtham1412-p

CONTRIBUTING.md

@@ -5,27 +5,31 @@ NOTE: *We DO NOT add leetcode problems. They are just applications of basic prin
 ### Did you find a bug?
 
 **Ensure the bug was not already reported** by searching on GitHub under [Project Issues](https://github.com/TheAlgorithms/Java/issues).
-  - If it is mentioned in the issues and you want to fix it, [fork](https://github.com/TheAlgorithms/Java/fork) the repository and submit your implementation in a pull request. The project maintainers will evaluate it.
-  - If the bug is **NOT** mentioned in the issues, [open a new issue](https://github.com/TheAlgorithms/Java/issues/new). Be sure to include a **title**, a clear **description** and a **test case** demonstrating the expected behavior that is not occurring.
+
+* If it is mentioned in the issues and you want to fix it, [fork](https://github.com/TheAlgorithms/Java/fork) the repository and submit your implementation in a pull request. The project maintainers will evaluate it.
+* If the bug is **NOT** mentioned in the issues, [open a new issue](https://github.com/TheAlgorithms/Java/issues/new). Be sure to include a **title**, a clear **description** and a **test case** demonstrating the expected behavior that is not occurring.
 
 NOTE: *Please avoid opening issues asking to be "assigned" to a particular algorithm. This merely creates unnecessary noise for maintainers. Instead, please submit your implementation in a pull request and project maintainers will evaluate it.*
 
 
 
 ### Do you want to contribute to the documentation?
-   - [Fork](https://github.com/TheAlgorithms/Java/fork) the repository and make necessary changes.
-   - Create a pull request.
-   - It will be put under review for approval.
-   - If approved, the requested changes will be merged to the repository.
+
+* [Fork](https://github.com/TheAlgorithms/Java/fork) the repository and make necessary changes.
+* Create a pull request.
+* It will be put under review for approval.
+* If approved, the requested changes will be merged to the repository.
 
 ### Do you want to add a new feature?
 
-- [Open a new issue](https://github.com/TheAlgorithms/Java/issues/new).
-- Be sure to include a **title**, a clear **description** and a **test case** demonstrating the new feature you want to add to the project.
+* [Open a new issue](https://github.com/TheAlgorithms/Java/issues/new).
+* Be sure to include a **title**, a clear **description** and a **test case** demonstrating the new feature you want to add to the project.
+
 
 
 ### Do you have questions about the source code?
 
-- Ask any question about how to use the repository in the [TheAlgorithms room in GITTER](https://gitter.im/TheAlgorithms/community?source=orgpage#) or [open a new issue](https://github.com/TheAlgorithms/Java/issues/new)
+* Ask any question about how to use the repository in \[TheAlgorithms Discord server](https://discord.gg/c7MnfGFGa6) or [open a new issue](https://github.com/TheAlgorithms/Java/issues/new)
+
+:+1::tada: That's all you need to know about the process now it's your turn to help us improve the repository, thank you again! :+1::tada:
 
-:+1::tada: That's all you need to know about the process now it's your turn to help us improve the repository, thank you again! :+1::tada: