Make group deletion easier

[axlewin]

• Sci: fix sidebar group deletion icon not displaying properly
• Both sites: add a "delete group" button for archived groups as an alternative way to delete groups

[codecov]

Codecov Report

❌ Patch coverage is 58.33333% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.55%. Comparing base (99a861b) to head (db10778).
⚠️ Report is 30 commits behind head on main.

Files with missing lines	Patch %	Lines
src/app/components/pages/Groups.tsx	58.33%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1810      +/-   ##
==========================================
- Coverage   41.56%   41.55%   -0.01%     
==========================================
  Files         543      543              
  Lines       23784    23785       +1     
  Branches     7863     7032     -831     
==========================================
  Hits         9885     9885              
- Misses      13256    13857     +601     
+ Partials      643       43     -600     

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[sjd210]

LGTM 👍 Just waiting on release