Directly include instructions for Node v9 installation in readme, fix #247

Closes #247

See merge request bloodyhealth/drip!113

Resolve "set up labels folder and reorganize labels"

Closes #251

See merge request bloodyhealth/drip!112

Signed-off-by: Jan-Christoph Borchardt <hey@jancborchardt.net>

Resolve "bug: svg errors"

Closes #246

See merge request bloodyhealth/drip!111

Resolve "Bigger clickable space for arrows in cycle day overview"

Closes #219

See merge request bloodyhealth/drip!109

Resolve "remove getorcreateCycleDay"

Closes #240

See merge request bloodyhealth/drip!107

Resolve "indicate active menu item"

Closes #138

See merge request bloodyhealth/drip!108

Resolve "change cycle day color in chart" (depends on !100)

Closes #213

See merge request bloodyhealth/drip!103

Resolve "improve chart scroll"

Closes #244

See merge request bloodyhealth/drip!106