Update cms.php

[mattkatt]

FileService.php, when saving images, looks for a declaration in config/cms of max-image-size, with a default to 800px:

//cms/src/Services/FileService.php
118    if ($isImage) {
119            $storage = Storage::disk(Config::get('cms.storage-location', 'local'));
120            $image = $storage->get($directory.$newFileName.'.'.$extension);
121    
122            $image = InterventionImage::make($image)->resize(config('cms.max-image-size', 800), null, function ($constraint) {
123                $constraint->aspectRatio();
124            });
125
126            $imageResized = $image->stream();
127    
128            $storage->delete($directory.$newFileName.'.'.$extension);
129            $storage->put($directory.$newFileName.'.'.$extension, $imageResized->__toString());
130        }

this config variable is not declared, and can be confusing if trying to upload hero_images larger than 800px. Propose adding the variable to the config/cms file by default