Fixes #5204: Update the documation to add an upgrade part about RHEL6
Fixes #5205: Incomplete command to force inventory
Merge pull request #68 from Kegeruneku/bug_5204/int/5204_fix_upgrade_documentation_for_rpm_oses

Fixes #5204: Update the documation to add an upgrade part about RHEL6
Merge pull request #69 from peckpeck/bug_5205/incomplete_command_to_force_inventory

Fixes #5205: Incomplete command to force inventory
Fixes #5348 - Update screenshots of Rudder 2.6
Merge pull request #72 from nperron/bug_5348/dev/update_screenshots_for_2_6

Fixes #5348 - Update screenshots of Rudder 2.6
Fixes #5181: Do not use contrib and non-free
Merge pull request #75 from jooooooon/bug_5181/do_not_use_contrib_and_non_free

Fixes #5181: Do not use contrib and non-free
Fixes #5611: Modified upgrading techniques section so new techniques are added as well
Merge pull request #77 from fanf/bug_5611/correct_technique_upgrade_git_command

Fixes #5611: Modified upgrading techniques section so new techniques are...