docs: mention having to build for mobile#2975

s-h-a-d-o-w wants to merge 2 commits intostandardnotes:mainstandardnotes/app:mainfrom

s-h-a-d-o-w:improve-mobile-build-docss-h-a-d-o-w/nonstandardnotes:improve-mobile-build-docsCopy head branch name to clipboard