Add a fact checker feature with updated styling (#835)

- Add an experimental feature used for fact-checking falsifiable statements with customizable models. See attached screenshot for example. Once you input a statement that needs to be fact-checked, Khoj goes on a research spree to verify or refute it.
- Integrate frontend libraries for [Tailwind](https://tailwindcss.com/) and [ShadCN](https://ui.shadcn.com/) for easier UI development. Update corresponding styling for some existing UI components. 
- Add component for model selection 
- Add backend support for sharing arbitrary packets of data that will be consumed by specific front-end views in shareable scenarios

src/interface/web/app/chat/page.tsx

@@ -58,6 +58,7 @@ function Loading() {
 
 function handleChatInput(e: React.FormEvent<HTMLInputElement>) {
     const target = e.target as HTMLInputElement;
+    console.log(target.value);
 }
 
 export default function Chat() {
@@ -71,6 +72,7 @@ export default function Chat() {
                 setLoading(false);
                 // Render chat options, if any
                 if (data) {
+                    console.log(data);
                     setChatOptionsData(data);
                 }
             })