it looks like you have done some of the configuration to customize the instance.(http://oar-sci-gaia.readthedocs.org/en/latest/oar-config.html)
However, there are still several other aspects to change
1. CFG_SITE_SUPPORT_EMAIL not set
2. DOI/PID not customized (follow this guide http://oar-sci-gaia.readthedocs.org/en/latest/oar-doi.html)
At this point, the repository is ready to use.
You need to consult the invenio manual, which is included in the installation https://repository.renu.ac.ug/help/
To show that the repository is working, why don't you try to submit a document.
The document won't show up in collection until a workflow to process it has been done:
don't forget to run:
sudo -u www-data ./bibindex
sudo -u www-data ./webcoll
sudo -u www-data ./bibsched
in particular to set bibsched in automatic mode, in order to avoid having to run these manual steps in the future. Your internal documentation will help