fix(aesthetic problems): Fixed some  aesthetic bugs on navigation-sub, pagination & grid
feature(documentation): Added to SCSS documentation Variables and functions
update changelog
fix(changelog): added clean task to avoid duplicated changelogs registries
docs(SCSS): Added Variables and functions
fix(code visualization): Fix issue related with blank spaces on code visualization UI
feat(JS Unit Test); added tests for code beautifier, sidemenu and truncate UI
update JS submodule