[DOCS] Fix a typo
[TASK] Normalize the vertical alignment accross all elements with the .btn class
[BUGFIX] Make sure the scrollSpy fn won't execute if there are no sub childs for the kss menu
Merge branch 'development' of https://github.com/t3b/t3b_template into development

* 'development' of https://github.com/t3b/t3b_template:
  [TASK] Remove t3b_common from the suggests array
  [TASK] Ignore the generated composer.lock file
  [TASK] Add an composer.json to the repository