Merge branch 'doc-webapp' into 'master'

docs/assets/changelog-service.png

docs/assets/credits-service.png

docs/assets/media-library-service.png

docs/assets/resources-service.png

docs/assets/reuses-service.png

docs/assets/social-media-share-helper.png

docs/assets/webapp/changelog.png

docs/assets/webapp/contact.png

docs/assets/webapp/credits.png

docs/assets/webapp/data.png

docs/assets/webapp/dataset-detail.png

docs/assets/webapp/download-resources.png

docs/assets/webapp/downloads-2.png

docs/assets/webapp/downloads.png

docs/assets/webapp/feedback.png

docs/assets/webapp/filters.png

docs/assets/webapp/footer.png

docs/assets/webapp/geo-resources.png

docs/assets/webapp/header.png

docs/assets/webapp/homepage.png