rewrite class components to functional components

[alexander-akait]

Many of our class components can be converted to more modern functional components

[sujalgoel]

On it. Starting with SidebarMobile since I was just in there, then working through the rest

[ryzrr]

can we add test to these components like dropdown which also uses the class based component ?

[alexander-akait]

Any tests are welcome

[sujalgoel]

working on converting the class components to functional ones, should I include tests in the same PR or keep it separate to stay focused?

[alexander-akait]

If something was changed very much tests will be great