Update doc for 3.0
Originally created by @sajolida on #11916 (Redmine)
Once we have a definitive version of the Greeter:
**** ./doc/first_steps/shutdown.mdwn [#12361 (closed)]
**** ./doc/first_steps/startup_options.mdwn [#5680 (closed)]
**** ./doc/first_steps/startup_options/bridge_mode.inline.mdwn [#5680 (closed)]
**** ./doc/first_steps/startup_options/network_configuration.mdwn [#5680 (closed)]
**** ./doc/first_steps/startup_options/administration_password.mdwn [#5680 (closed)]
**** ./doc/first_steps/startup_options/offline_mode.mdwn [#5680 (closed)]
**** ./doc/first_steps/startup_options/bridge_mode.mdwn [#5680 (closed)]
**** ./doc/first_steps/startup_options/mac_spoofing.mdwn [#5680 (closed)]
**** ./doc/first_steps/persistence/use.mdwn [#12361 (closed)]
**** ./doc/first_steps/persistence/check_file_system.mdwn
**** ./doc/first_steps/persistence/configure.mdwn [#12361 (closed)]
**** ./doc/first_steps/persistence/copy.mdwn [#12381 (closed)]
**** ./doc/first_steps/persistence/change_passphrase.mdwn
Once we have a testing Debian Sid environment:
**** ./doc/advanced_topics/virtualization/boxes.mdwn [created #12378 (closed)]
**** ./doc/advanced_topics/virtualization/virt-manager.mdwn [created #12380 (closed)]
Once we got rid of TopIcons:
**** ./doc/encryption_and_privacy/gpgapplet.warning.mdwn
**** ./doc/encryption_and_privacy/gpgapplet.mdwn
./doc/encryption_and_privacy/gpgapplet/passphrase_encryption.mdwn
./doc/encryption_and_privacy/gpgapplet/public-key_cryptography.mdwn
**** ./doc/encryption_and_privacy/gpgapplet/decrypt_verify.mdwn
Once we have a testing OS X environment:
**** ./install/mac/clone.mdwn
**** ./install/mac/usb.mdwn
**** ./install/mac/dvd.mdwn
**** ./doc/first_steps/reset/mac.mdwn
Misc:
**** ./doc/advanced_topics/lan.mdwn (Places → Connect to Server… is wrong but I couldn’t test it better) [created #12376 (closed)]
**** ./doc/encryption_and_privacy/manage_passwords.mdwn [created #11917 (closed)]
Feature Branch: feature/11916-stretch-doc