Creates landing

- New landing page, replaces the dashboard as an index page.
- Moves the dashboard to a new endpoint /dashboard

Fixes #83
Fix coordinate order for bbox/point bounds
Merge pull request #171 from lukecampbell/landing-rb

Creates landing
Remove point indicators on data provider switch on asset map
Merge pull request #175 from benjwadams/remove_indicators_on_layer_switch

Remove point indicators on data provider switch on asset map
Merge pull request #174 from benjwadams/fix_coord_order_bbox

Fix coordinate order for bbox/point bounds
Changed "asset map" to just "map" on landing page
Fixes glider tracks by removing non-real lat/lon
Removes global g
Merge pull request #176 from lukecampbell/rename

Changed "asset map" to just "map" on landing page
Merge pull request #177 from lukecampbell/tracks

Fixes glider tracks by removing non-real lat/lon
Merge branch 'master' of https://github.com/duncombe-noaa/catalog