automatically resize logos

Project logos show up full-size, which can be way too big. Should constrain logos to be a max size.
(I thought there was an already issue about this but I don't see it.)

To fix this, edit the style="..." in

berkeleybop.github.io/_layouts/software.html

Lines 7 to 9 in f4abfe1

    
           {% if page.logo %} 
        
           <img alt="logo" src="{{page.logo}}"/> 
        
           {% endif %}

I'm not very experienced in css and don't know what to change there. 😕

	{% if page.logo %}
	<img alt="logo" src="{{page.logo}}"/>
	{% endif %}