feat: add file types whitelist for image processing

[CaiJimmy]

Add allowedTypes and resizableTypes to imageProcessing configuration

Prior to this commit, SVG images were not processed by render-image.html because SVG does not have a physical dimension like JPEG. This logic was done using a conditional.

I have now realised that Hugo can be very slow when resizing gif images. So I created this whitelist mechanism:

• allowedTypes: image types with width and height attributes
• resizableTypes: image types that can be resized

Here's a list of media types: bmp, gif, jpeg, png, svg+xml, tiff, webp

https://gohugo.io/templates/output-formats/#media-types

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