Currently profile images are sized using CSS. If images whose actual
size in pixels is larger than the defined pfp-size in CSS pixels is used
and the page is viewed on a web browser that does not support the latest
CSS standards, the profile images appear larger than intended.

This change moves the size information into the HTML code. Since
HTML sizes are also in terms of CSS pixels, this does not change the
results for browsers that implement modern standards, but will provide
better rendering on older or more limited browsers.