Added mkdocs-glightbox (image zoom plugin) and fixed image references

.gitlab-ci.yml

doc/alarms_actions.md

doc/architecture/architecture.md

doc/architecture/cridge/cridge_introduction.md

doc/architecture/issuemgt.md

doc/architecture/osom.md

doc/contributing/documenting.md

...onfiguration/consuming_services_from_external_partners.md

doc/history.md

doc/index.md

doc/naas/gst_to_tmf.md

doc/naas/lcm_intro.md

doc/naas/lcm_rules_intro.md

doc/naas/service_catalog.md

doc/naas/so_intro.md

doc/naas/so_servicespec_to_services_nfv.md

doc/service_design/lcmrules/examples.md

doc/service_design/lcmrules/intro.md

doc/service_design/lcmrules/specification.md

mkdocs.yml