refine dataset detail UI

numerous UI improvements and bug fixes to dataset detail page

• add error messages for timeouts and other errors from the timeseries service
• bugfixes to geometry persistence and restoration (more improvements to come in #54)
• add ability to switch basemaps

improved area management

Improvements related to #25 #26 #28 #29

• selected areas are now persisted to local storage and loaded on refresh
• users can save the selected area as GeoJSON and load an existing GeoJSON file (needs testing across a wider variety of GeoJSON, not just the exported ones)

patched prerelease

• fix off by one error in timeseries service
• add favicon #21
• tagging published release before vuetify 2.0 changes
• production now running in production mode instead of using the nuxt dev server #22

initial release

tagging alpha release before vuetify 2.0 update