In /projects list add 'alt' tag to img for accessibility (#393)
In /projects list add 'alt' tag to img for accessibility (#393)

The W3C validator noted that these img references did not have
an 'alt' value for accessibility.  Fix that.
This partly addresses issue #390.

Signed-off-by: David A. Wheeler <9ae72d22d8b894b865a7a496af4fab6320e6abb2@dwheeler.com>
coreinfrastructure/best-practices-badge,taylorcoursey/cii-best-practices-badge,linuxfoundation/cii-best-practices-badge,coreinfrastructure/best-practices-badge,jdossett/cii-best-practices-badge,linuxfoundation/cii-best-practices-badge,wanganyv/cii-best-practices-badge,jdossett/cii-best-practices-badge,yannickmoy/cii-best-practices-badge,wanganyv/cii-best-practices-badge,taylorcoursey/cii-best-practices-badge,taylorcoursey/cii-best-practices-badge,dwvisser/cii-best-practices-badge,taylorcoursey/cii-best-practices-badge,yannickmoy/cii-best-practices-badge,coreinfrastructure/best-practices-badge,yannickmoy/cii-best-practices-badge,dwvisser/cii-best-practices-badge,dwvisser/cii-best-practices-badge,yannickmoy/cii-best-practices-badge,linuxfoundation/cii-best-practices-badge,wanganyv/cii-best-practices-badge,dwvisser/cii-best-practices-badge,jdossett/cii-best-practices-badge,jdossett/cii-best-practices-badge,coreinfrastructure/best-practices-badge,wanganyv/cii-best-practices-badge,linuxfoundation/cii-best-practices-badge