♿ [#2352] Remove faulty aria-label and add external link

[jiromaykin]

issue: https://taiga.maykinmedia.nl/project/open-inwoner/task/2343

This approach ensures that screen readers can read both the visible link text (inside the a-href anchor) and the additional information about the link opening a new/different website, which is information coming from the meaningful icon.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 95.19%. Comparing base (6157084) to head (3c5a94d).
Report is 16 commits behind head on develop.

Files	Patch %	Lines
src/open_inwoner/utils/ckeditor.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1257      +/-   ##
===========================================
- Coverage    95.22%   95.19%   -0.04%     
===========================================
  Files          974      978       +4     
  Lines        35471    35607     +136     
===========================================
+ Hits         33778    33896     +118     
- Misses        1693     1711      +18     

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[alextreme]

Assigning to Paul for review next week, requires a double-check