Finish rebranding stuff

[kylezs]

• - 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.
• - "View on Explorer" still points to lokiblocks.com #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?