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RBAC tutorial;add files from previous version of tutorial to create links in current tutorial to them

-change the structure of the text

add indentation to the "Create the dev version of the project" section

-change the structure of the text

update text of the introduction section

add list to the menu block

Update text from the section about SELECT to the Many attribute

update MANY type description text

-remove the section of installing UBE model(deprecated)

Text reorganized

Text reorganized until 'Creating diagramm entity' section

Text has rewritten for better understanding

-wrapp shell commands with ```shell```;
-reorganize some sentences

-add a note about how to fill Model field in form creation

-add < > to urls;

-add full path to urls

-wrapp shell commands with ```shell ```;
-add < > to urls;
-add nl before images