[UI] Add LinkedIn button in footer

[idanlodzki]

Description:
Add a new button in the footer that links to OpsiMate’s official LinkedIn page:
https://www.linkedin.com/company/opsimate/

Details:

The button should use the LinkedIn logo or icon.

It should appear alongside the existing social media or contact links in the footer.

Ensure it looks consistent with the current design (light/dark modes).

Open the link in a new tab (target="_blank").

Definition of Done (DOD):

✅ LinkedIn button is visible in the footer.

✅ Clicking it opens OpsiMate’s LinkedIn page in a new tab.

✅ Works on both light and dark themes.

[MohammadRehaanDev]

Hello @idanlodzki! O would like to oslve this issue for Hacktober Fest can you please assign it to me