Extend getting started - Sign in

[dmijatovic]

We allow login in with SURFconext and since recently ORCID. We also added some explanation in the login form and we link to this page. https://github.com/research-software-directory/documentation/edit/main/docs/getting-started.md

I propose to add section where we link to our IdP in SURFconext which shows institution that use a service
https://dashboard.surfconext.nl/apps/9514/oidc10_rp/about

We can also add paragraph about ORCID and leave emai link to contact us.