Implement a count down timer for future releases

[Ambient-Impact]

This can be used on the maintenance page when we have that styled and laid out in a pleasant way. See neurocracy/drupal-omnipedia-site-theme#10

Timers

Custom examples

• https://codepen.io/AllThingsSmitty/pen/JJavZN
• https://codingartistweb.com/2021/09/responsive-countdown-to-a-certain-date-javascript/

Libraries

• https://github.com/caike/jQuery-Simple-Timer
• https://www.jqueryscript.net/blog/best-countdown-plugins.html

Aesthetics

• https://www.jqueryscript.net/time-clock/Simple-Countdown-Timer-Plugin-jQuery.html