Help follow Docs structure

[Dmytro Prodchenko]

Description

To generate proper structure for Help this file should be used (https://osmand.net/help-structure.json) now instead of old sitemap.xml

Backend task https://github.com/osmandapp/OsmAnd-Issues/issues/2341
Previous task #3161

Popular articles:

• Use ios": { "popularArticles": to get list of popular articles
• • Order of appearance similar to the file

User guide

• Use "level": 2, to get list of items
• • Order of appearance similar to the file

Troubleshooting

• Troubleshooting Article should be excluded from list and put into separate section Troubleshooting

[DmitrySvetlichny]

#3435

[DmitryAlexei]

• improve displaying of articles according to new .json

[DmitrySvetlichny]

#3447