invenio module that adds tugraz configs.

Override configs from diffrent invenio modules to meet TU Graz requirement:

• Invenio-App
• Invenio-Mail
• Invenio-shibboleth
• Invenio-accounts
• Flask-security
• Defined routes for TUG

Further documentation is available on https://invenio-config-tugraz.readthedocs.io/