Add steps to how setup Butterfly with Nextcloud in storage.md

[JerryMerweather]

I am still not finished, not sure what else to include.

Please call copilot because this is a draft with slight editing.

• [X] Steps 4 Nextcloud
• [ ] Add pictures
• [ ] Explain more about webDAV for non-nextcloud setups

[JerryMerweather]

That is amazing As for images, I am having a hard time finding a markdown editor that could show me how my images will look.

I dont want to setup node.js

EDIT: I did anyway. also https://www.jotbird.com/ is good editor