Remove outdated build section from README

11 jobs for 165-switch-to-cmake in 6 minutes and 41 seconds (queued for 1 second)
Status Job ID Name Coverage
  Images
manual #49037211
allowed to fail manual
build_image_ubuntu
manual #49037212
allowed to fail manual
build_image_win32
manual #49037213
allowed to fail manual
build_image_win64
 
  Build
manual #49037219
macos allowed to fail manual
macos
passed #49037214
ubuntu_appimage

00:06:41

passed #49037215
win32_build

00:03:55

manual #49037217
windows allowed to fail manual
win32_vs_build
passed #49037216
win64_build

00:05:28

manual #49037218
windows allowed to fail manual
win64_vs_build
 
  Installer
manual #49037220
allowed to fail manual
win32_vs_installer
manual #49037221
allowed to fail manual
win64_vs_installer