user-menu.html the changes are 95% spaces/tabs/formatting/indention fixes.
apt.md was removed because there should be only one article for Linux (besides one for Mac, one for Windows, ...), containing both installation methods and all other related topics. Having one of the methods in an extra file doesn't make sense.
linux.md apt as base, a few things from the rasspi document, many new chapters. Still missing: de/reinstallation, backup, manual->non-root, manual->upgrade, probably more
rasppi.md moved a few chapters to linux.md
Squash commits
Update
Add first half of manual installation instructions
Update linux.md
Update linux.md
Update linux.md
Update linux.md
Update linux.md
Update linux.md
Update linux.md
Update linux.md
Update linux.md
Add notes on apt snapshot installation
Update rasppi and index
Add backup info
Fix small details