fix: update browser tab title from 'Vite + React' to 'LearnHub'

[Vachhani-Tapan]

Description: Changed the <title> in frontend/index.html from "Vite + React" to

 ## Type of Change
                                                                                       
 - [x] 🐛 Bug fix (non-breaking change which fixes an issue)                           
                                                                                       
 ## Checklist                                                                        
                                                                                     
 - [x] My code follows the style guidelines of this project.
 - [x] I have performed a self-review of my own code.
 - [x] My changes generate no new warnings or console errors.
 - [ ] I have tested my changes locally and verified they work as expected.            
 
 ## Screenshots / Screen Recordings (if applicable)                             
                                                                                       
 N/A - single-line HTML change

Fixes : #26

[udaycodespace]

Description: Changed the <title> in frontend/index.html from "Vite + React" to

 ## Type of Change
                                                                                       
 - [x] 🐛 Bug fix (non-breaking change which fixes an issue)                           
                                                                                       
 ## Checklist                                                                        
                                                                                     
 - [x] My code follows the style guidelines of this project.
 - [x] I have performed a self-review of my own code.
 - [x] My changes generate no new warnings or console errors.
 - [ ] I have tested my changes locally and verified they work as expected.            
 
 ## Screenshots / Screen Recordings (if applicable)                             
                                                                                       
 N/A - single-line HTML change

Fixes : #26

LGTM. Welcome to LearnHub :)

For future PRs, try bundling small fixes like #26 with a related issue, such as #27. It makes for a stronger contribution and could qualify for an L3 label.