feat: redesign electrs page

[cstenglein]

[cstenglein]

FYI @escapedcat : i removed the light variant of the back button in the app page, it was hard to read that way and is consistent with the electrs page.

[cstenglein]

From @openoms :

QR Code needs a white border

[cstenglein]

Changed the Design a bit, now centered a bit more stuff.

Aligning it to the left like @rootzoll suggested wasn't looking that good IMO.

[cstenglein]

If the screen isn't wide enough, it clips the tor address.

Not sure how to handle it better. Copy works ofc, but you may not be able to see the whole address: