Improve readability by removing some small class modifiers

Some of the pages of the project have readability issues because the text is too
small. We removed the CSS classes to increase the size and improve on that.

Co-authored-by: Dany Marcoux <dmarcoux@suse.com>
Co-authored-by: David Kang <dkang@suse.com>
Co-authored-by: Henne Vogelsang <hvogel@opensuse.org>
Co-authored-by: Saray Cabrera Padrón <scabrerapadron@suse.de>
Co-authored-by: Victor Pereira <vpereira@suse.com>
Co-authored-by: Lukas Krause <lkrause@suse.de>