Some documentation extensions

docs/data/eln.md

docs/examples/computational_data/data/Si_gw.zip

docs/examples/computational_data/data/example_files.zip

docs/examples/computational_data/data/workflowyaml_files.zip

docs/examples/computational_data/images/data_page.png

docs/examples/computational_data/images/datasets_page.png

...amples/computational_data/images/edit_author_metadata.png

docs/examples/computational_data/images/entries.png

docs/examples/computational_data/images/fullworkflow.png

docs/examples/computational_data/images/gwupload.gif

docs/examples/computational_data/images/logs_page.png

docs/examples/computational_data/images/newuser_register.png

docs/examples/computational_data/images/nomad_metainfo.png

docs/examples/computational_data/images/nomadmetainfo.png

docs/examples/computational_data/images/overview_page.png

docs/examples/computational_data/images/pressure1.png

docs/examples/computational_data/images/publish.png

docs/examples/computational_data/images/singlepoint.png

...les/computational_data/images/singlepoint_methodadded.png

...examples/computational_data/images/top_fields_uploads.png