v1.6.0-rc.1

Full Changelog

• Enable cross-signing / E2EE by default for DM on release
  #13179
• Upgrade to React SDK 2.5.0-rc.1 and JS SDK 5.3.1-rc.1
• Add instruction to resolve the inotify watch limit issue
  #13128
• docs: labs: add a pointer to config.md
  #13149
• Fix Electron SSO handling to support multiple profiles
  #13028
• Add riot-desktop shortcuts for forward/back matching browsers&slack
  #13133
• Allow rageshake to fail in init
  #13164
• Fix broken yarn install link in README.md
  #13125
• fix build:jitsi scripts crash caused by a missing folder
  #13122
• App load order changes to catch errors better
  #13095
• Upgrade deps
  #13080