New theme for newsletter template

[antopalidi]

fixes #24

• add config_accessor :themes
• add new fields for capitalitat theme:
  • :intro_link_text
  • :intro_link_url
  • :footer_box_description_num
  • :footer_additional_text

[codecov]

Codecov Report

Patch coverage: 97.05% and project coverage change: +0.25% 🎉

Comparison is base (eb5f785) 97.02% compared to head (67bbd98) 97.28%.

❗ Current head 67bbd98 differs from pull request most recent head beb6cd7. Consider uploading reports for the commit beb6cd7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   97.02%   97.28%   +0.25%     
==========================================
  Files           5        5              
  Lines         202      221      +19     
==========================================
+ Hits          196      215      +19     
  Misses          6        6              

Files Changed	Coverage Δ
lib/decidim/newsletter_agenda/engine.rb	97.56% <96.49%> (+0.30%)	⬆️
...ls/decidim/newsletter_agenda/agenda_events_cell.rb	94.87% <100.00%> (+0.42%)	⬆️
...sletter_agenda/agenda_events_settings_form_cell.rb	100.00% <100.00%> (ø)
lib/decidim/newsletter_agenda.rb	100.00% <100.00%> (ø)

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[microstudi]

good job. In the future maybe we will have to separate more the specific themes into different folders for admin too. For the moment it's ok