Add LinkedIn URL for projects/companies

[caniszczyk]

We should have cards have the ability to have a linkedin URL just like we do with twitter URLs, e.g., cncf/landscape#2952

We should also display this in the UI natively.

cc: @AndreyKozlov1984

[AgniveshChaubey]

Hey @caniszczyk @AndreyKozlov1984, I am new to open source but have good knowledge of JavaScript. I wanna work on this issue in order to start my open-source journey. Is there any help required?

[ashutosh887]

@AndreyKozlov1984 @caniszczyk I would like to take this up

[draunger]

/assign me sir i will do this task

[draunger]

@AndreyKozlov1984 if you not have any problem can i work on this

[AndreyKozlov1984]

I think it is not used for CNCF anymore, they switched to a new version of the landscape