Bug 23259: Remove reset-fonts-grids.css

Bug 23259: Remove reset-fonts-grids.css

This patch removes the CSS file reset-fonts-grids.css which was required
when the staff client templates used YUI grids. Now that all staff
client templates have been converted to Bootstrap grid markup the file
can be deleted.

Because the YUI CSS also did set some baseline properties for different
tags the global SCSS file is modified in this patch in order to keep
things looking consistent. Most of these updates change font-size
declarations to preserve the previous appearance.

Some styling has been added to (non Bootstrap-classed) <input> and
<button> tags in order to keep button style consistent.

Removed from staff-global.scss: YUI-specific CSS which has been made
obsolete by the template conversions.

To test, apply the patch and rebuild the staff client CSS
(https://wiki.koha-community.org/wiki/Working_with_SCSS_in_the_OPAC_and_staff_client).
Clear your browser cache if necessary.

Browse through various pages of thes staff client to confirm that the
changes work well.

Signed-off-by: Nadine Pierre <nadine.pierre@inLibro.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>