Finish rebranding stuff

[kylezs]

• [x] - Rename repo to oxen-electron-gui-wallet
• [ ] - Github actions links to use oxen-io
• [ ] - LNS -> ONS
• [ ] - Service nodes -> Prepare registration confirm box is still dark, should be white
• [ ] - Create wallet without setting password, popup warning "No password set", still Loki theme
• [ ] - Export key image confirm box is dark
• [ ] - Big sur size icon for Mac
• [ ] - When doing sweep all the “Confirm” (or similar) button is in white with no text.
• [x] - https://github.com/oxen-io/oxen-electron-gui-wallet/issues/266

[cryptolokimax]

Suggestion to add to the list (see https://t.me/Oxen_Community/274980): When doing sweep all the “Confirm” (or similar) button is in white with no text.

[mdPlusPlus]

I assume the rebranding is done by now, isn't it?