Add image upload for the organisation

[marsrobertson]

When creating a new organisation - add image upload.

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We already have upload of the files to IPFS

Upload of the image - proceed as previously - just display the image after it is uploaded.

Even better:

• display it immediately
• CSS filter (a little bit blurred, a little bit grayed out)
• spinner on top
• after the upload is completed remove the spinner and filter

[marsrobertson]

It doesn't look great on the Kleros side: https://curate.kleros.io/tcr/5/0x370Aa27bc8c7Db549494568D6AD704520Cb48C87