Move inline scripts into their separate files

See merge request fairdata/invenio-theme-tuw!6

* also, remove the LOCAL_LOGIN_ENABLED configuration variable, because
  that's now part of Invenio-Accounts

* previously, some javascript snippet from invenio-theme would fail
  because our header doesn't follow the expected structure (i.e.
  expected elements were missing)

*) typo fixed

matomo url fixed

See merge request fairdata/invenio-theme-tuw!5

* add alt text for logos, hidden labels for search controls

* this resulted in invalid html and thus in weird visuals

* override the header template from invenio-app-rdm to make the search
  button orange
* fix the wrong text color on the login button

login fixed

See merge request fairdata/invenio-theme-tuw!4

* removed trailing whitespaces
* also, hide staging warning per default

Development

See merge request fairdata/invenio-theme-tuw!3

Fwoerister/uiupdate

See merge request fairdata/invenio-theme-tuw!2

staging banner to page template

* add links to the cards on the frontpage
* have the "learn more" link point to the roadmap of Invenio RDM

* have the browser open the legal documents in a new tab
* link to the english version of forschungsdaten.at
* move the invenio_theme_tuw templates into the semantic-ui directory
* add flask extension for the module that instantiates the blueprint and
  moves it to the front of app._blueprint_order, such that it is
  encountered before the blueprints from invenio-app-rdm during
  render_template
* this enables us to place the template overrides in theme-tuw instead
  the git repository for tu data

* Fix static assets not being found on some subpages (via use of url_for)
* Fix some text having the same color as the background