Remove lodash dependency and minor cleanup

[thenickberry]

Summary

remove unnecessary dependency:

• lodash can be replaced with pure Javascript

cleanup in style.css:

• px was missing from height/width
• removed button and .cardBank

general:

• unused comments and references were removed
• added alt tag to for accessibility

gary additions:

• Kasparov
• Gygax
• Larson
• Winthorpe

Testing

% eslint tierlist.js && echo $?
0
% stylelint style.css && echo $?     
0
% html-validate index.html && echo $?
0

[thenickberry]

I did not include the config files for eslint or stylelint, or the instructions for them and html-validate since it added files to the repo and initially felt like overkill. I can add to this PR if you like.