chore(DashboardHeader) convert to TS

chore(DashboardWrapper) convert to TS

chore(Table) convert demos to TS

Author: Dominik-Petrik

packages/react-core/index.d.ts renamed to packages/react-core/src/components/assets/custom.d.ts

@@ -0,0 +1,4 @@
+declare module '*.svg' {
+  const content: string;
+  export default content;
+}