Style changes after tests

[antopalidi]

• Fix PeerTube link
• Change the icons to a higher resolution quality
• reduce the width footer logo for desktop
• introduction text – align left
• width of images in the footer boxes the full width of the element
• change the font size for the mobile version to match the design

[codecov]

Codecov Report

Patch coverage: 20.00% and project coverage change: -3.67 ⚠️

Comparison is base (64036ee) 97.02% compared to head (ca1f957) 93.36%.

❗ Current head ca1f957 differs from pull request most recent head 9a768b8. Consider uploading reports for the commit 9a768b8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   97.02%   93.36%   -3.67%     
==========================================
  Files           5        5              
  Lines         202      211       +9     
==========================================
+ Hits          196      197       +1     
- Misses          6       14       +8     

Impacted Files	Coverage Δ
...ls/decidim/newsletter_agenda/agenda_events_cell.rb	85.18% <20.00%> (-9.26%)	⬇️

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.