use index instead of number for scenario page, block, info page

[tnagorra]

Depends on

• change ordering of scenario page, info block and info pages mapswipe-assets#22

Changes

• Change bing imagery g parameter
• Use index instead of specified numbers for scenario page, info block and info pages
• Update slack message formatting

Details

• Tutorial with issue in staging: https://managers-stage.mapswipe.org/tutorial/16/edit
• Reference project of that tutorial: https://managers-stage.mapswipe.org/project/629/edit

This PR doesn't introduce any:

• temporary files, auto-generated files or secret keys
• n+1 queries
• flake8 issues
• print
• typos
• unwanted comments

This PR contains valid:

• tests
• permission checks (tests here too)
• translations

[codecov]

Codecov Report

❌ Patch coverage is 84.61538% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.69%. Comparing base (1ae590b) to head (07d6a51).
⚠️ Report is 5 commits behind head on develop.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
apps/project/slack_messages.py	25.00%	3 Missing ⚠️
project_types/base/tutorial.py	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #207      +/-   ##
===========================================
- Coverage    87.70%   87.69%   -0.01%     
===========================================
  Files          204      204              
  Lines        12237    12240       +3     
  Branches      1034     1035       +1     
===========================================
+ Hits         10732    10734       +2     
- Misses        1122     1123       +1     
  Partials       383      383              

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