Convert files in themes/ services/ contexts/ to TS

Convert all Javascript files in `client/src/themes`, `client/src/service`, `client/src/contexts` to Typescript.
Convert SvgIcon, Input, ConversationView, Button components to Typescript

Gitlab #30

Change-Id: I0d0505c28e21c771906edf8d5e7b8ce36126fa64
diff --git a/client/src/index.tsx b/client/src/index.tsx
index 9a68d34..e23c463 100644
--- a/client/src/index.tsx
+++ b/client/src/index.tsx
@@ -14,7 +14,7 @@
 
 import { store } from '../redux/store';
 import App from './App';
-import { SocketProvider } from './contexts/socket.js';
+import { SocketProvider } from './contexts/Socket';
 
 const queryClient = new QueryClient({
   defaultOptions: {