✨(react) add themes switching in Storybook

We want to be able to visualize easily themes directly inside
Storybook. This was not a trivial task as there is no centralized
logic to handle Doc / Stories / Manager at the same time.

packages/react/public/logo-cunningham.svg

@@ -7,16 +7,6 @@
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-            <feOffset/>
-            <feGaussianBlur stdDeviation="58.2902"/>
-            <feComposite in2="hardAlpha" operator="out"/>
-            <feColorMatrix type="matrix" values="0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 1 0"/>
-            <feBlend mode="normal" in2="BackgroundImageFix" result="effect1_dropShadow_16_5113"/>
-            <feBlend mode="normal" in="SourceGraphic" in2="effect1_dropShadow_16_5113" result="shape"/>
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             <stop offset="0.28125" stop-color="#5894E1"/>
             <stop offset="1" stop-color="#377FDB"/>