performance: Avoid enormous network payloads

[ychoy]

According to this audit report from Chrome Dev Tools, this can be enhanced to improve performance:

Large network payloads cost users real money and are highly correlated with long load times. Learn more: https://web.dev/total-byte-weight?utm_source=lighthouse&utm_medium=devtools

URL	Size
/4de5fac….jpg(census-2020.herokuapp.com)	1,804 KB
/0850b36….jpg(census-2020.herokuapp.com)	1,349 KB
/bundle.js(census-2020.herokuapp.com)	1,181 KB
/fd83f8b….jpg(census-2020.herokuapp.com)	1,092 KB
/71a5f84….jpg(census-2020.herokuapp.com)	819 KB
/34a2f27….jpg(census-2020.herokuapp.com)	725 KB
…en_US/base.js(www.youtube.com)	398 KB
/8f026a6….jpg(census-2020.herokuapp.com)	301 KB
…imgbin/player-co….png(s.ytimg.com)	131 KB
/edcbb0f….png(census-2020.herokuapp.com)	127 KB

[aelar13]

I'm going to try to at least reduce the file size somewhat for the header graphics.