feat: more cf2021 related updates (animatiotns, buttons, iframe-container

source/_patterns/00-atoms/04-animations/ping.mustache

.../01-molecules/20-dropdown-button/dropdown-button.mustache

source/_patterns/03-templates/cf2021/anonymous.mustache

source/_patterns/03-templates/cf2021/chairman.mustache

source/_patterns/03-templates/cf2021/user.mustache

source/css/atoms/animations.pcss

source/css/style.pcss

source/css/templates/cf2021.pcss

tailwind-plugins/buttons.js