Add Help in the top right menu

[AnaBelgun]

Based on discussions recorded here: https://docs.google.com/document/d/1Y7Z1EwwkzuBrOgrqowxauJ0-p4v70oVGyoDztOSwoUY/edit

• add help button in the top right hand side menu similar to https://soe.terria.io/

• fix the issue with users not being able to return to previous step (in case they are at step 2)

Add the following options/guides:

• Explore map data

• Interact with the data. To include instructions on general interaction with datasets and more specifically for satellite imagery

• Zoom in to show satellite, flag to user he needs to wait to load to get imagery

• Calendar - time

• Zoom to location and filter by location

• Splitter

other?

• Add your own data

• Change map settings

• Share/Export/Print

[AnaBelgun]

temporarily (for GEO Week) point the help button to the About - Help pages http://de-australia.terria.io/help/help.html

[rowanwins]

Done