[button] Added 'book demo' btn in navigation bar

[HarshDeep61034]

Description
Added the book demo btn to navigation bar on https://layer5.io

This PR fixes #4956

Notes for Reviewers

Signed commits

• [ x ] Yes, I signed my commits.

[l5io]

🚀 Preview for commit 854f981 at: https://65144bab734c0809cf53a43c--layer5.netlify.app

[saurabh100ni]

Let's discuss this in tomorrow's website meeting,
Please add it in the Doc, If you would ^^:
https://docs.google.com/document/d/1XczAHXVe2FIWPqiF57ospJ43zw5cZQ7ui8mn39v5EvA/edit

[HarshDeep61034]

@abhijeetgauravm plz look into this been so long.

[abhijeetgauravm]

hey @HarshDeep61034 I think the PR wasn't discussed in the last website meeting. Let's discuss this on website call today at 5:30 PM IST / 7 AM Central time. Please add this as an agenda item in the meeting minutes

[l5io]

🚀 Preview for commit 99cd25f at: https://65b3b6dbd0b5be121d1c6c58--layer5.netlify.app

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.