reorganizing documentation

.gitignore

docs/admin_docs/source/_static/gracedb-nav-style.css

docs/admin_docs/source/_templates/layout.html

docs/admin_docs/source/client_release.rst

docs/admin_docs/source/conf.py

docs/admin_docs/source/dev.rst

docs/admin_docs/source/index.rst

docs/admin_docs/source/miscellaneous.rst

docs/admin_docs/source/new_event_subclass.rst

docs/admin_docs/source/new_gracedb_instance.rst

docs/admin_docs/source/new_pipeline.rst

docs/admin_docs/source/new_server_feature.rst

docs/admin_docs/source/ops.rst

docs/admin_docs/source/phone_alerts.rst

docs/admin_docs/source/public_gracedb.rst

docs/admin_docs/source/robot_certificate.rst

docs/admin_docs/source/shibbolized_client.rst

docs/admin_docs/source/user_permissions.rst

docs/user_docs/source/_static/gracedb-nav-style.css

docs/user_docs/source/_templates/layout.html