[#1432] Opening links from FAQ

[linssen814]

Edited utils/ckeditor.py so that the links on the FAQ answers don't open in a new tab anymore. Also added link icons to them.

Taiga: https://taiga.maykinmedia.nl/project/open-inwoner/issue/1432

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 94.18%. Comparing base (f76f455) to head (a1c4603).

Files with missing lines	Patch %	Lines
src/open_inwoner/utils/ckeditor.py	0.00%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1633      +/-   ##
===========================================
- Coverage    94.20%   94.18%   -0.02%     
===========================================
  Files         1086     1086              
  Lines        40026    40033       +7     
===========================================
  Hits         37705    37705              
- Misses        2321     2328       +7     

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[jiromaykin]

Requesting changes:

1. Change the underline/text-decoration. External links with an icon should only have their text itself be underlined, there should not be a line under the icon itself. For an example, look at the product pages, like this one https://open-inwoner-test.maykin.nl/onderwerpen/zorg-en-ondersteuning/producten/huiselijk-geweld/ that contains external links with proper icons and proper text-decoration:
2. Slightly better process when creating a new PR: first switch back to Develop branch, then do a git pull, and then create a new branch from Develop. This way you will have a correct commit history. When a task takes longer you can just rebase to Develop, before doing your final commit and only then ask for review.
3. Add a link to your PR in the Taiga issue as well.

[pi-sigma]

@jiro @linssen814 Note that this PR is based on an older user story and seems to be in tension with the recent https://taiga.maykinmedia.nl/project/open-inwoner/us/3014 (PR: #1631), which requires that links to formulieren and acties be opened in a new tab. The rationale is that otherwise users get the wrong impression that closing the tab will destroy their OIP session (which is not the case because they will log in via an external service to create/resume a form, thus closing the tab will destroy that session but not their OIP session).