[DOCS] Controls appearance management - prevent close of the last tra…

…ck (#772)

* Ability to configure the visibility of Browser pane controls for using in iFrame (#707) - option for preventing last non-reference track from close (docs updated)

* Minor style fix

Co-authored-by: Nikita Shaforostov <nikita_shaforostov@epam.com>
(cherry picked from commit 1c66343)

Bump NGB to 2.7.0

Bump NGB to 2.6.1

Update v2.6.md

Merge pull request #83 from epam/develop

Release 2.5.1

Added PR template

Datasets tree visualizing - optimized

Fix CLI "sort" bug with empty lines in feature files

2.4 version

2.3 version