Manual:Non-clickable Images

Warning
The following involves editing Linker.php, a core MediaWiki file. It is a very simple procedure, but if you feel at all uncomfortable editing core files, do not do so. Make sure to create a backup copy of Linker.php before making the suggested edit.

How to
Open the file Linker.php from your includes folder and go to the function makeImageLink2. Find the lines:

Change the value of 'desc-link' from true to false so that it now appears as

The images in your wiki should now be non-clickable.