members only datasets frontend v2

[struan]

This does three things:

• hides non public datasets from unauthenticated users
• updates the area page layout a bit to tidy up the resulting empty boxes etc for unauthenticated users
• turns off the mandatory login for all pages

Fixes #280

This replaces #312 which was too out of sync with the area page updates.

[zarino]

@struan I’ve pushed a fixup commit that adds a yellow section to the bottom of the area page, advertising the extra data for logged in members:

Migrations hell prevented me actually testing this out, so I did the work in main and then cherry-picked into this branch, guessing that {% if not user.is_authenticated %} was the right thing to check in the template – please replace if not :-)

(FYI longer term, I think we’ll split this yellow section into two columns, and use one of the columns to host the email signup form required by #377.)

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (d7fda40) 82.80% compared to head (9cb7bd2) 83.17%.
Report is 7 commits behind head on multiple-geometry-staging.

Files	Patch %	Lines
hub/transformers.py	33.33%	6 Missing ⚠️
hub/mixins.py	33.33%	3 Missing and 1 partial ⚠️
hub/management/commands/base_importers.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@                      Coverage Diff                      @@
##           multiple-geometry-staging     #392      +/-   ##
=============================================================
+ Coverage                      82.80%   83.17%   +0.36%     
=============================================================
  Files                            100      100              
  Lines                           3077     3007      -70     
  Branches                         347      315      -32     
=============================================================
- Hits                            2548     2501      -47     
+ Misses                           454      430      -24     
- Partials                          75       76       +1     

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