def relabel_df(df):
    """
    Modify the column labels to fit into Jekyll. Default to lowercase.
    """
    df = df.rename(index={'Title': 'title',
                          'Teaser text': 'excerpt',
                          'Description': 'description',
                          'Example projects': 'projects',
                          'Tags': 'tags',
                          'Mentors': 'mentors',
                          'Resources': 'resources',
                          'Badge': 'badge',
                          'Level': 'level'
                          })
    return df