Navigation: Remove note about contributing to the documentation project

Author: amotl

docs/index.md

@@ -236,17 +236,4 @@ performance/index
 ```
 
 
-:::{note}
-CrateDB and its documentation are open source projects.
-Contributions to all pages are much appreciated.
-If you can spot a flaw, or if you would like to contribute
-additional content, you are most welcome.
-
-To submit change requests where this project is hosted on [GitHub],
-you can find corresponding links within the
-topmost right navigation element on each page.
-:::
-
-
-[GitHub]: https://github.com/crate/cratedb-guide
 [Overview of CrateDB integration tutorials]: https://community.cratedb.com/t/overview-of-cratedb-integration-tutorials/1015