Relocate Downloads chart on OLAQ article pages

[carakey]

OLAQ has requested publicly visible usage statistics. The Downloads chart that comes as part of the Usage Statistics plugin appears in an undesirable location on the article landing pages, in between the Abstract and the Author Biography.

Discussions point to making theme changes to move the chart to a more desirable location. Moving it to the bottom of the page after the descriptive metadata would be an improvement. Making the chart smaller and putting it in the right sidebar would be ideal, if possible.

Slack discussion on 2020-08-03 included this tip: a Child Theme looks like it could work: https://docs.pkp.sfu.ca/pkp-theming-guide/en/child-themes (esp "2. Adjust the HTML code behind the single article template...")