SH User details page polish

[vcarl]

• add more statistics to top of page (More advanced statistics calculations #167)
  • merge word count + message count charts. maybe, background vs outline?
  • show a trendline of word per message overlaid on messages chart
  • show a trendline of reactions per message (per word?) on messages chart
  • calculate statistical summary of overall time interval. How many participants; messages; words; words/person; activity breakdown by channel.
• fix Discord layout Guild selector layout #106