* There is only one word inside the buttons and that too was wrapped
inside `span.text` which was unnecessary. This is removed. All
corresponding properties (font-size) are moved to `.button`.
* Since the only `a` inside image actions are these buttons, all
the properties are transfered to `.button`.
* Similarly, properties for `.icon` are moved to `.button` and it is
also removed from the template.
* Font size was redundant for `.icon`
* display property is moved
This should make it easier to find the templates that are actually
part of the core webapp, instead of having them all mixed together
with the portico pages.