Contributing guide 404 in azure.github.io

[jongio]

https://azure.github.io/azure-sdk-for-js/#contributing

Contributing guide link 404s

[ramya-rao-a]

Thanks for reporting @jongio

@KarishmaGhiya, @scbedd The corresponding link in the repo readme is fine. The one rendered in the azure.github.io docs is the one that is invalid. Please take a look

[KarishmaGhiya]

PR - #6663