increase flexibility in tutorial page layout and arrangement

[danbjoseph]

scope a proposal for overhauling how tutorials are setup as it would be useful to have increased flexibility, especially with the information presented on the first page.

for example, what if the JSON for the screens could include info pages that aren’t linked to geojson features/ map tiles, but rather have a block of HTML or markdown that is used on a blue page like the one at the start, so that you could insert more than one info page and include whatever you want on them?

Sam C: For change detection tutorials, is there any chance that the 'Instructions' can be generalized? At the moment they are specific to building changes and this may confuse contributors that are working on projects that involve looking at changes in other features (for example forest loss in my project).
Benni: we can change this only in the app code, but you are absolutely right that this should be adapted or changed
Sam C: One thing I noticed, and may be my mistake - for the change detection tutorial I added a ground and satellite photo but it does not show up in the tutorial, is that page skipped for change detection tutorials?
Benni: yep it's not implemented and the images are not used for this project type. sorry that all this information is not really documented.

[danbjoseph]

when tackling this, should consider translating - mapswipe/mapswipe#183