Resolve "add menu bar and basic navigation"

Closes #132

See merge request bloodyhealth/drip!53

Resolve "chart improvements"

Closes #82

See merge request bloodyhealth/drip!52

Resolve "Add Import button"

Closes #114

See merge request bloodyhealth/drip!48

Implement Sex \o/:

Closes #69

See merge request bloodyhealth/drip!50

Resolve "add stats button on home screen and show stats about period length"

Closes #109

See merge request bloodyhealth/drip!41