fix links

docs.it4i/anselm/capacity-computing.md

docs.it4i/anselm/compute-nodes.md

docs.it4i/anselm/hardware-overview.md

docs.it4i/anselm/introduction.md

docs.it4i/anselm/job-submission-and-execution.md

docs.it4i/anselm/resources-allocation-policy.md

docs.it4i/anselm/shell-and-data-access.md

docs.it4i/anselm/storage.md

docs.it4i/environment-and-modules.md

...al/accessing-the-clusters/graphical-user-interface/vnc.md

...sing-the-clusters/shell-access-and-data-transfer/putty.md

docs.it4i/general/accessing-the-clusters/vpn-access.md

docs.it4i/general/applying-for-resources.md

...i/general/obtaining-login-credentials/certificates-faq.md

docs.it4i/general/resource_allocation_and_job_execution.md

docs.it4i/index.md

docs.it4i/job-features.md

docs.it4i/prace.md

docs.it4i/salomon/capacity-computing.md

docs.it4i/salomon/compute-nodes.md