Write Documentation regarding deployment in github page

[Showrin]

Description

We can deploy our nextjs app on various platforms; Github Page is one of them. Our goal is to guide users with proper steps on how to deploy the nextjs app on the GitHub page.

Add Deployment Guideline at the end of the TOC and README (if it's not added already). Under this section add How to Deploy on Github Page section and write the instructions here.

Things to check before submission

• The steps provided are clear and concise enough
• No missing steps
• The app can be deployed successfully following the given steps
• The new section has been added to the TOC
• A note has been added regarding the deletion of additional files if a user is not using the Github Page for deployment (If we've to add any additional files)

Please, copy and paste these checkpoints into the PR and mark each of them after completion.

[monjurul0007]

@Showrin i will be taking this issue. Thanks

[Showrin]

Sure @monjurul0007, you can take this. I'm assigning it to you.