Accessibility bug: Missing focus indicators for keyboard navigation

## URL
https://gofr.dev

## Problem
When navigating the site using the keyboard (Tab key), most buttons and navigation links do not display a visible focus outline.
This is an accessibility issue — it makes it difficult for keyboard users or those with vision impairments to know where they are on the page.

## Suggestion
Add proper `:focus` or `focus-visible` styling to interactive elements.
Tailwind or CSS solutions like `outline`, `ring`, or `focus:outline` can be used.

I'd love to work on this as part of GoFr Summer of Code 2025 – Website Upgrade Track. Please assign this to me. 🙂