Update docs.it4i/opencode.it4i.eu.md, docs.it4i/img/b2access-fill.jpg,...

Update docs.it4i/opencode.it4i.eu.md, docs.it4i/img/b2access-fill.jpg, docs.it4i/img/b2access-select.jpg, docs.it4i/img/b2access.jpg, docs.it4i/img/b2access-no_account.jpg, docs.it4i/img/b2access-social.jpg, docs.it4i/img/b2access-univerzity.jpg