feat: Adding dark mode, cleaning the UI a small bit, adding a link to the API documentation, and linting the code. (#2182)

# What does this PR do?

This PR adds a few enhancements:
- Dark mode 
- A dark mode icon
- Adds a link to the API documentation
- Adds prettier and a linter to the code 
- Aligning the default text
- Linted the code 

## Before:
![Screenshot 2025-05-15 at 3 57
15 PM](https://github.com/user-attachments/assets/996db083-4a4f-4683-a2b4-e7c09de96135)

## After (dark mode):
![Screenshot 2025-05-15 at 3 57
50 PM](https://github.com/user-attachments/assets/9d45d26b-2449-4a5f-813e-29e07e94b793)

[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
[Describe the tests you ran to verify your changes with result
summaries. *Provide clear instructions so the plan can be easily
re-executed.*]

[//]: # (## Documentation)


Related to https://github.com/meta-llama/llama-stack/issues/2085

---------

Signed-off-by: Francisco Javier Arceo <farceo@redhat.com>

llama_stack/ui/components/ui/separator.tsx

@@ -1,9 +1,9 @@
-"use client"
+"use client";
 
-import * as React from "react"
-import * as SeparatorPrimitive from "@radix-ui/react-separator"
+import * as React from "react";
+import * as SeparatorPrimitive from "@radix-ui/react-separator";
 
-import { cn } from "@/lib/utils"
+import { cn } from "@/lib/utils";
 
 function Separator({
   className,
@@ -18,11 +18,11 @@ function Separator({
       orientation={orientation}
       className={cn(
         "bg-border shrink-0 data-[orientation=horizontal]:h-px data-[orientation=horizontal]:w-full data-[orientation=vertical]:h-full data-[orientation=vertical]:w-px",
-        className
+        className,
       )}
       {...props}
     />
-  )
+  );
 }
 
-export { Separator }
+export { Separator };