websites/Gitlab-Issue-Listing-Script#20: Add support for images in Wikis

OK, so the image link does come through in the markdown:

The domain `gils.bentasker.co.uk` is configured to point to it


![IMG_20220410_224836](uploads/e66ce282ecc4d630ccbe798f4fa07e0f/IMG_20220410_224836.jpg)

So, we probably just need to catch that and redirect it to the right place.

This was implemented (a while back) for images in issues, so might be possible to re-use the code from that.

In fact, it looks like it's easier than that.

The image is correctly converted to an image tag, we just need the router to be able to handle it.

For issues we have a check to see if we're looking for uploads:

            case "issue":
                if ($path_split[4] == "uploads"){
                    // It's an image request
                    return array(
                        "section" => "issue",
                        "subsection" => implode("/",array($path_split[2], $path_split[3])),
                        "issid" => false,
                        "img_path" => implode("/",array_slice($path_split, -3)),
                        "sef" => $sef                        
                    );
                }

                return array(
                    "section" => "issue",
                    "subsection" => implode("/",array_slice(array_slice($path_split, -3),0, 2)),
                    "issid" => end($path_split),
                    "sef" => $sef                        
                );

We just need to implement similar for the wiki section