require progressbar 2.3 because of import issues with 2.2
twitter/opengraph metadata cleanup

use configured site root for collection image paths; add og description

[#75230428 #76531236]
minor twitter/opengraph cleanup for readability
add description for volume twitter/g+ metadata; remove deprecated twitter:url

[#75230428 #76531236]
remove deprecated twitter:url for single and multiple page views

[#75230428 #76531236]