Merge Weather and Climate explorer

[mmaelicke]

First draft to merge weather and climate data explorer.

Remaining tasks:

• Come up with a transition concept between the three explorers
• make sure session state is emptied, when needed
• mark placeholders
• mark missing translation

[codecov]

Codecov Report

Merging #77 (d2ecb2f) into main (2dd0f8b) will increase coverage by 0.55%.
The diff coverage is 10.82%.

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   18.86%   19.41%   +0.55%     
==========================================
  Files          23       21       -2     
  Lines        1882     1890       +8     
==========================================
+ Hits          355      367      +12     
+ Misses       1527     1523       -4     

Impacted Files	Coverage Δ
ruins/apps/weather.py	25.60% <10.25%> (-9.62%)	⬇️
ruins/core/config.py	78.16% <100.00%> (-0.25%)	⬇️
ruins/components/model_scale_select.py	19.51% <0.00%> (+19.51%)	⬆️

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[AlexDo1]

I really like the new layout, the app feels much better structured now.

At first glance, everything seems to work. I have only one suggestion: it was not quite clear to me how to navigate from the Weather Explorer to the Climate Explorer, as this option is quite hidden in the sidebar under the "Learn more" button, especially on smaller screens.

I think it would be clearer if we displayed something like "Continue to Climate Explorer" or even the "Learn More" button on the main page rather than in the sidebar.

[AlexDo1]

I think now it is better, looks very good.