Add comments to includes in  index.txt
Add information to folder '/admin-basics'

index.txt:
	-add comments
	-add new topicks (includes)
driver-saga.txt
	-new topick about "What hided behind word 'driver'"
/os-principles/index.txt
	-new topick about files, file system, disk names,
	 console commands and other.
/user-management/index.txt
	-new topick about "How to add new or edit existing
	 users"
vm.txt: paraphrase
Merge branch 'master' into centaurus

Conflicts:
	admin-basics/index.txt
	index.txt
Add info about support *.docx in app libreOffice
Remove word "Mozilla" in subtopics about "Thunderbird"
Update information about "Pidgin"
Remove numbers before all level 4 topics: "==== topic ===="

Add "[float]" before all 4 level topics:
   now subtopics look more readable
   for example it was "61.1.1. blabla" and now it become "blabla"
   but it is still looks like subtopic. All difference is that now
   there is no numbers before topic name.

Conflicts:
	maint/index.txt
	services/index.txt
	system-server/index.txt
Merge branch 'master' into centaurus

Conflicts:
	desktop-software/internet/mail/thunderbird/index.txt