Front-end updates

[ewels]

Front-end HTML / CSS / JS

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1. Update template to latest Bootstrap (with dark mode) #1698
   core: front end priority: low +2
2. Remove ClipboardJS, use native browser JS #2408
   core: front end +1

Plotly stretch goals

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1. Violin plot: avoid cropping long tick labels #2302
   core: front end +1
2. Handle click events in Plotly and support RSeQC single_sample_plot #2307
   core: front end +1
3. Scatter plot - click+drag to select and highlight samples #297
   core: front end +1
4. Add plot scaling for command line export #876
   core: back end +1
5. Make FastQC's sequence-content plots a shared plot-type #1102
   core: front end +1
6. bar plot textures/hatching/pattern #1934
   core: back end +1
7. Plot confidence area around a linegraph #2214
   core: front end +1
8. Show line markers if low sample count #2324
   core: front end +1
9. Refactor: first-class support for plot "views" #2392
   core: back end +1
10. Bar plot tooltip: customize as it was in HighCharts #2420
    core: front end +1