refactor(add-location): simplify layout with two-column design #280

[escapedcat]

Fixes: #280

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[dadofsambonzuki]

Needs a bit of spacing between options on mobile.

Also, supertagger link should be:

https://gitea.btcmap.org/teambtcmap/btcmap-general/wiki/Tagging-Merchants#shadowy-supertaggers-

[escapedcat]