Merge branch 'fwoerister/themev2' into 'development'

..._tuw/assets/semantic-ui/less/invenio_theme_tuw/theme.less

invenio_theme_tuw/static/images/fair-data-austria.png

invenio_theme_tuw/static/images/magnifying-glass.png

invenio_theme_tuw/static/images/rating.png

invenio_theme_tuw/static/images/rdmlogo.png

invenio_theme_tuw/static/images/reuse.png

invenio_theme_tuw/static/images/signet.png

invenio_theme_tuw/static/images/upload-file.png

invenio_theme_tuw/templates/invenio_theme_tuw/footer.html

invenio_theme_tuw/templates/invenio_theme_tuw/frontpage.html

invenio_theme_tuw/templates/invenio_theme_tuw/header.html