Describe server and workstation hardening

https://pedia.altinn.cloud/sec/security-architecture/networkandendpoint/os-hardening/ (or pages referred to from this page) should be updated with more details on OS hardening (servers and workstations, e.g. developer images). Once approved, relevant parts should be migrated from pedia to docs.

Start by reviewing the linked OS hardening page and the pages it refers to, then identify the details needed for server and workstation hardening, including developer images. Document the agreed material, obtain approval, and migrate the relevant approved parts from pedia to the repository's docs.

Written by the indexing model from the issue text.