Accessible links
Currently, the links (<a>) to the project/software websites are wrapped by <button> elements.
I don't know, if this special case is bad for screen reader users, at least to me it seems a bit uncommon and ugly.
If there's no reason why we use that <button> tag, we should just remove it. (More information: https://www.w3schools.com/accessibility/accessibility_buttons_links.php)