docs: adapt contributing guidelines based on how Omnipath team work.

Author: ecarrenolozano

docs/assets/project-banner-readme.png

@@ -0,0 +1,8 @@
+# Code of Conduct
+
+This project follows the Contributor Covenant v2.1.
+
+- View the full text in the repository: [Code of Conduct](https://github.com/saezlab/ontograph/blob/main/CODE_OF_CONDUCT.md)
+- [Contributor Covenant website](https://www.contributor-covenant.org/version/2/1/code_of_conduct/)
+
+If you need to report a concern, please email: [edwin.carreno@iwr.uni-heidelberg.de](mailto:edwin.carreno@iwr.uni-heidelberg.de)

docs/community/CONTRIBUTING.md

@@ -1,8 +1,9 @@
 Welcome to the ontograph community! We follow open-source principles and
-encourage any sort of contribution. We communicate on GitHub, where we also
+encourage any sort of contribution. We communicate on [GitHub](https://github.com/saezlab/ontograph), where we also
 organise our projects.
 
-> Please review our [Code of Conduct](../../CODE_OF_CONDUCT.md) before participating in issues, discussions, and pull requests.
+!!! note
+    Please review our [Code of Conduct](code-of-conduct.md) before participating in issues, discussions, and pull requests.
 
 <div class="grid cards" markdown>
 
@@ -17,8 +18,20 @@ organise our projects.
 
 </div>
 
+<div class="grid cards" markdown>
+
+-   :octicons-list-unordered-24:{ .lg .middle } __Contributing Overview__
+
+    ---
+
+    A concise checklist and best practices for contributing.
+
+    [:octicons-arrow-right-24: Open overview](CONTRIBUTING.md)
+
+</div>
+
 
 ## Contributing Guidelines GitHub Links
 
 - Contribution guidelines (coming soon in this docs section)
-- [Code of Conduct](../../CODE_OF_CONDUCT.md)
+- [Code of Conduct](code-of-conduct.md)