Remove buttons default padding

[mstrasinskis]

Motivation

Currently, a button tag by default has a small (0.5rem) horizontal padding. This breaks the alignment in the account menu because some entries are rendered with an a tag, which has no extra padding, while others use a button tag.

There are not so many affected buttons. For many buttons the padding is overwritten: g.e..primary, .secondary, .success, .danger, .warning (based on the button.base mixin), icon-only, 'icon'.

The buttons that are affected by the changes in this PR: .full-width, .ghost, .text, .with-icon, .card.

Changes

• Set the padding 0 by default for buttons. This will not affect most of the buttons, only that who uses no @button.base mixin (copy button,
• Remove padding: 0 from the places where the default padding is not needed.

Screenshots