fix: megamenu centered in small screen

[jjagielka]

📑 Description

Fix for mega menu centre problem.

#184 (comment)

In fact it was an issue of NavDropdown not MegaMenu.

I have modified the column number in small screen views as well. Please check if ok.

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
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